Sources

Every fact in Animal Friends should be traceable. These are the sources our entries draw on, grouped by how authoritative they are for the claims they support.

Tier 1 Emperor penguin — Australian Antarctic Program, Department of Climate Change, Energy, the Environment and Water
Tier 1 Model systems for regeneration: Hydra — Development (The Company of Biologists)
Tier 1 Red Swamp Crayfish (Procambarus clarkii) — Species Profile — USGS Nonindigenous Aquatic Species (NAS) Database
Tier 1 Staghorn Coral (Acropora cervicornis) — species profile — NOAA Fisheries (National Oceanic and Atmospheric Administration)
Tier 1 Guidance on the Conservation of the Atlantic Puffin — Agreement on the Conservation of African-Eurasian Migratory Waterbirds
Tier 1 Ambystoma mexicanum — Species Account — AmphibiaWeb, University of California, Berkeley
Tier 1 Domestic chicken diversity: Origin, distribution, and adaptation — Animal Genetics (Wiley)
Tier 1 Antarctic krill — Australian Antarctic Program
Tier 1 Box Jellyfish — Australian Museum
Tier 1 Western Clown Anemonefish, Amphiprion ocellaris Cuvier, 1830 — Australian Museum
Tier 1 Laughing Kookaburra (Dacelo novaeguineae) — Australian Museum
Tier 1 Red Kangaroo (Osphranter rufus) — Australian Museum
Tier 1 Antarctic wildlife — British Antarctic Survey
Tier 1 Common Ostrich Struthio camelus — Species Factsheet — BirdLife International
Tier 1 Emperor Penguin Aptenodytes forsteri — Species Factsheet — BirdLife International (IUCN Red List Authority for birds)
Tier 1 Laughing Kookaburra Dacelo novaeguineae — Species Factsheet — BirdLife International
Tier 1 Mandarin Duck Aix galericulata — Species Factsheet — BirdLife International
Tier 1 State of Africa's Birds 2017 — BirdLife International
Tier 1 Lumbricus terrestris — CABI Compendium Datasheet — CABI
Tier 1 Krill fisheries and sustainability — Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR)
Tier 1 Life Cycle of Aedes Mosquitoes — Centers for Disease Control and Prevention (CDC)
Tier 1 Endorsement of the African Elephant Action Plan — Convention on the Conservation of Migratory Species of Wild Animals
Tier 1 Acinonyx jubatus — CMS species page — Convention on the Migratory Species of Wild Animals (CMS)
Tier 1 Peregrine Falcon Life History — All About Birds — Cornell Lab of Ornithology
Tier 1 White Shark (Carcharodon carcharias) — Species Profile — Florida Museum of Natural History, University of Florida
Tier 1 Gearing Up for Warmer Times: Transcriptomic Response of Spongia officinalis to Elevated Temperatures Reveals Recruited Mechanisms and Potential for Resilience — Frontiers in Marine Science
Tier 1 Celebrating the American Alligator — U.S. Fish and Wildlife Service
Tier 1 The Beaver Restoration Guidebook: Working with Beaver to Restore Streams, Wetlands, and Floodplains — U.S. Fish and Wildlife Service
Tier 1 Climate Change 2022: Mitigation of Climate Change — Chapter 7 — Intergovernmental Panel on Climate Change
Tier 1 Loxodonta africana (African Bush Elephant) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Psittacus erithacus (Grey Parrot) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Alligator mississippiensis (American Alligator) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Castor canadensis (North American Beaver) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Lithobates catesbeianus (American Bullfrog) — Red List Assessment — IUCN Red List of Threatened Species / IUCN SSC Amphibian Specialist Group
Tier 1 Phoenicopterus ruber (American flamingo) — Red List category — IUCN Red List of Threatened Species
Tier 1 Homarus americanus (American Lobster) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Turdus migratorius (American Robin) — Red List Assessment — IUCN Red List of Threatened Species / BirdLife International (Red List Authority for birds)
Tier 1 Anax junius (Common Green Darner) — Red List category — IUCN Red List of Threatened Species
Tier 1 Apis mellifera (Western Honey Bee) — European Red List of Bees assessment — IUCN Red List of Threatened Species
Tier 1 Architeuthis dux — IUCN Red List assessment — IUCN Red List of Threatened Species
Tier 1 Elephas maximus (Asian Elephant) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Callinectes sapidus — IUCN Red List status check — IUCN Red List of Threatened Species
Tier 1 Thunnus thynnus (Atlantic Bluefin Tuna) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Gadus morhua (Atlantic Cod) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Fratercula arctica (Atlantic Puffin) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Ambystoma mexicanum (Axolotl) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Haliaeetus leucocephalus (Bald Eagle) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Python regius (Ball Python) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Toxotes jaculatrix (Banded Archerfish) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Tyto alba (Western Barn Owl) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Lates calcarifer (Barramundi) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Spongia officinalis — Red List status — IUCN Red List of Threatened Species
Tier 1 Actinia equina (Beadlet anemone) — conservation status — IUCN Red List of Threatened Species
Tier 1 Mytilus edulis — IUCN Red List (no assessment found) — IUCN Red List of Threatened Species
Tier 1 Tiliqua scincoides (Eastern Blue-tongued Lizard) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Balaenoptera musculus (Blue Whale) — IUCN Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Lineus longissimus — conservation status — IUCN Red List of Threatened Species
Tier 1 Pongo pygmaeus (Bornean Orangutan) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Ursus arctos (Brown Bear) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Pelecanus occidentalis (Brown Pelican) — Red List Assessment — IUCN Red List of Threatened Species / BirdLife International (Red List Authority for birds)
Tier 1 Bradypus variegatus (Brown-throated Three-toed Sloth) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Bombus terrestris (Buff-tailed Bumblebee) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Rhinella marina (Cane Toad) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Parastichopus californicus (Apostichopus californicus) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Carassius auratus (Goldfish) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Chamaeleo calyptratus (Veiled Chameleon) — IUCN Red List conservation status — IUCN Red List of Threatened Species
Tier 1 Nautilus pompilius (Chambered Nautilus) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Acinonyx jubatus (Cheetah) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Pan troglodytes (Chimpanzee) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Andrias davidianus (Chinese Giant Salamander) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Amphiprion ocellaris (Clown Anemonefish) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Birgus latro (Coconut Crab) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Turdus merula (Common Blackbird) — Red List Assessment — IUCN Red List of Threatened Species / BirdLife International (Red List Authority for birds)
Tier 1 Tursiops truncatus (Common Bottlenose Dolphin) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Forficula auricularia — IUCN Red List status check — IUCN Red List of Threatened Species
Tier 1 Photinus pyralis (Common Eastern Firefly) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Rana temporaria (Common Frog) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Thamnophis sirtalis (Common Garter Snake) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Phalangium opilio — IUCN Red List (no assessment found) — IUCN Red List of Threatened Species
Tier 1 Pagurus bernhardus — IUCN Red List status check — IUCN Red List of Threatened Species
Tier 1 Alcedo atthis (Common Kingfisher) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Octopus vulgaris (Common Octopus) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Gerris lacustris — IUCN Red List status check — IUCN Red List of Threatened Species
Tier 1 Struthio camelus (Common Ostrich) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Carcinus maenas — IUCN Red List status check — IUCN Red List of Threatened Species
Tier 1 Bufo bufo (Common Toad) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Vombatus ursinus (Bare-nosed / Common Wombat) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Pantherophis guttatus (Corn Snake) — Red List conservation status — IUCN Red List of Threatened Species
Tier 1 Cornu aspersum (Garden Snail) — IUCN Red List status — IUCN Red List of Threatened Species
Tier 1 Dermochelys coriacea (Leatherback) — IUCN Red List conservation status — IUCN Red List of Threatened Species
Tier 1 Dingo (Canis dingo / Canis lupus dingo) — conservation status — IUCN Red List of Threatened Species
Tier 1 Felis catus (Domestic Cat) — conservation status note — IUCN Red List of Threatened Species
Tier 1 Bos taurus (domestic cattle) — conservation status — IUCN Red List of Threatened Species
Tier 1 Canis lupus familiaris (domestic dog) — conservation status — IUCN Red List of Threatened Species
Tier 1 Capra hircus (domestic goat) — conservation status — IUCN Red List of Threatened Species
Tier 1 Equus ferus caballus (domestic horse) — conservation status — IUCN Red List of Threatened Species
Tier 1 Sus scrofa domesticus (domestic pig) — conservation status — IUCN Red List of Threatened Species
Tier 1 Electrophorus electricus (Electric Eel) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Anax imperator (Emperor Dragonfly) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Aptenodytes forsteri (Emperor Penguin) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Pandinus imperator (Emperor Scorpion) — conservation status — IUCN Red List of Threatened Species / CITES
Tier 1 Dromaius novaehollandiae (Emu) — Red List Assessment — IUCN Red List of Threatened Species / BirdLife International
Tier 1 Eublepharis macularius (Common Leopard Gecko) — Red List category — IUCN Red List of Threatened Species
Tier 1 Anguilla anguilla (European Eel) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Erinaceus europaeus (Western European Hedgehog) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Homarus gammarus (European Lobster) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Mantis religiosa (European Mantis) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Oryctolagus cuniculus (European Rabbit) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Erithacus rubecula (European Robin) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Loligo vulgaris — IUCN Red List (no assessment found) — IUCN Red List of Threatened Species
Tier 1 Gryllus campestris (Field Cricket) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Salamandra salamandra (Fire Salamander) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Hydra vulgaris — Red List status — IUCN Red List of Threatened Species
Tier 1 Chlamydosaurus kingii (Frilled Lizard) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Chelonoidis niger (Galápagos Giant Tortoise) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Myrmecophaga tridactyla (Giant Anteater) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Mobula birostris (Giant Manta Ray) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Gymnothorax javanicus (Giant Moray) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Enteroctopus dofleini (Giant Pacific Octopus) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Ailuropoda melanoleuca (Giant Panda) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Riftia pachyptila (Giant Tube Worm) — conservation status — IUCN Red List of Threatened Species
Tier 1 Giraffa camelopardalis (Giraffe) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Lumbricus terrestris — Global Invasive Species Database profile — IUCN SSC Invasive Species Specialist Group
Tier 1 Phyllobates terribilis (Golden Poison Frog) — IUCN Red List status (Endangered) — IUCN Red List of Threatened Species
Tier 1 Theraphosa blondi — Red List category — IUCN Red List of Threatened Species
Tier 1 Bubo virginianus (Great Horned Owl) — Red List Assessment — IUCN Red List of Threatened Species / BirdLife International (Red List Authority for birds)
Tier 1 Pecten maximus — IUCN Red List (no assessment found) — IUCN Red List of Threatened Species
Tier 1 Parus major (Great Tit) — Red List Assessment — IUCN Red List of Threatened Species / BirdLife International (Red List Authority for birds)
Tier 1 Carcharodon carcharias (Great White Shark) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Iguana iguana (Green Iguana) — Red List conservation status — IUCN Red List of Threatened Species
Tier 1 Chelonia mydas (Green Turtle) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Strongylocentrotus droebachiensis — conservation status — IUCN Red List of Threatened Species
Tier 1 Canis lupus (Grey wolf) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Diploria labyrinthiformis (Grooved Brain Coral) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Poecilia reticulata (Guppy) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Phoca vitulina (Harbour Seal) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Dynastes hercules (Hercules Beetle) — Red List conservation status — IUCN Red List of Threatened Species
Tier 1 Hippocampus kuda (Spotted / Yellow Seahorse) — IUCN Red List status — IUCN Red List of Threatened Species
Tier 1 Hippopotamus amphibius (Hippopotamus) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Passer domesticus (House Sparrow) — Red List Assessment — IUCN Red List of Threatened Species / BirdLife International (Red List Authority for birds)
Tier 1 Musca domestica (Housefly) — Red List conservation status — IUCN Red List of Threatened Species
Tier 1 Melanocetus johnsonii (Humpback Anglerfish) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Megaptera novaeangliae (Humpback Whale) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Panthera onca (Jaguar) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Nestor meridionalis (New Zealand Kaka) — Red List Assessment — IUCN Red List of Threatened Species / BirdLife International (Red List Authority for birds)
Tier 1 Strigops habroptilus (Kakapo) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Nestor notabilis (Kea) — Red List Assessment — IUCN Red List of Threatened Species / BirdLife International (Red List Authority for birds)
Tier 1 Phascolarctos cinereus (Koala) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Varanus komodoensis (Komodo Dragon) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Dacelo novaeguineae (Laughing Kookaburra) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Atta cephalotes — IUCN Red List status (Not Evaluated) — IUCN Red List of Threatened Species
Tier 1 Panthera pardus (Leopard) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Panthera leo (Lion) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Actias luna (Luna Moth) — Red List conservation status — IUCN Red List of Threatened Species
Tier 1 Anas platyrhynchos (Mallard) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Aix galericulata (Mandarin Duck) — Red List Status — IUCN Red List of Threatened Species
Tier 1 Synchiropus splendidus (Mandarinfish) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Hirudo medicinalis (Medicinal Leech) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Lycosa tarantula — IUCN Red List (no assessment found) — IUCN Red List of Threatened Species
Tier 1 Suricata suricatta (Meerkat) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Brachypelma hamorii (Mexican Redknee Tarantula) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Locusta migratoria (Migratory Locust) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Ninox novaeseelandiae (Morepork) — Red List Assessment — IUCN Red List of Threatened Species / BirdLife International (Red List Authority for birds)
Tier 1 Maccullochella peelii (Murray Cod) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Cygnus olor (Mute Swan) — Red List Assessment — IUCN Red List of Threatened Species / BirdLife International
Tier 1 Rhipidura fuliginosa (New Zealand Fantail) — Red List Assessment — IUCN Red List of Threatened Species / BirdLife International (Red List Authority for birds)
Tier 1 Apteryx mantelli (North Island Brown Kiwi) — Red List Assessment — IUCN Red List of Threatened Species / BirdLife International (Red List Authority for birds)
Tier 1 Cardinalis cardinalis (Northern Cardinal) — Red List Assessment — IUCN Red List of Threatened Species / BirdLife International (Red List Authority for birds)
Tier 1 Ginglymostoma cirratum (Nurse Shark) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Mola mola (Ocean Sunfish) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Vanessa cardui (Painted Lady) — IUCN Red List status check — IUCN Red List of Threatened Species
Tier 1 Ophiophagus hannah (King Cobra) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Orcinus orca (Killer Whale) — IUCN Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Manis pentadactyla (Chinese Pangolin) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Furcifer pardalis (Panther Chameleon) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Paracanthurus hepatus — IUCN Red List assessment — IUCN Red List of Threatened Species
Tier 1 Falco peregrinus (Peregrine Falcon) — IUCN Red List conservation status — IUCN Red List of Threatened Species
Tier 1 Magicicada septendecim — Red List category — IUCN Red List of Threatened Species
Tier 1 Equus quagga (Plains Zebra) — IUCN Red List conservation status — IUCN Red List of Threatened Species
Tier 1 Ornithorhynchus anatinus (Platypus) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Ursus maritimus (Polar Bear) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Physalia physalis (Portuguese man o' war) — conservation status — IUCN Red List of Threatened Species
Tier 1 Emperor penguin and Antarctic fur seal now Endangered due to climate change — IUCN Red List — International Union for Conservation of Nature (IUCN)
Tier 1 Migratory monarch butterfly now Endangered — IUCN Red List (press release) — International Union for Conservation of Nature (IUCN)
Tier 1 Porphyrio melanotus (Australasian Swamphen) — Red List Assessment — IUCN Red List of Threatened Species / BirdLife International (Red List Authority for birds)
Tier 1 Procyon lotor (Raccoon) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Trichoglossus moluccanus (Rainbow lorikeet) — Red List category — IUCN Red List of Threatened Species
Tier 1 Oncorhynchus mykiss (Rainbow Trout) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Pygocentrus nattereri (Red-bellied Piranha) — Red List status — IUCN Red List of Threatened Species
Tier 1 Agalychnis callidryas (Red-eyed Tree Frog) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Vulpes vulpes (Red Fox) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Gallus gallus (Red Junglefowl) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Osphranter rufus (Red Kangaroo) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Pterois volitans (Red Lionfish) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Sciurus vulgaris (Red Squirrel) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Procambarus clarkii (Red Swamp Crayfish) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Buteo jamaicensis (Red-tailed Hawk) — Red List Assessment — IUCN Red List of Threatened Species / BirdLife International (Red List Authority for birds)
Tier 1 Formica rufa (Red Wood Ant) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Phidippus regius — Red List category — IUCN Red List of Threatened Species
Tier 1 Lemur catta (Ring-tailed Lemur) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Columba livia (Rock Dove) — Red List Assessment — IUCN Red List of Threatened Species / BirdLife International (Red List Authority for birds)
Tier 1 Archilochus colubris (Ruby-throated Hummingbird) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Salmo salar (Atlantic Salmon) — Red List category — IUCN Red List of Threatened Species
Tier 1 Crocodylus porosus (Saltwater Crocodile) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Sphyrna lewini (Scalloped Hammerhead) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Ara macao (Scarlet Macaw) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Enhydra lutris (Sea otter) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Tachyglossus aculeatus (Short-beaked Echidna) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Betta splendens (Siamese Fighting Fish) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Lissotriton vulgaris (Smooth Newt) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Panthera uncia (Snow leopard) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Casuarius casuarius (Southern Cassowary) — Red List Assessment — IUCN Red List of Threatened Species / BirdLife International (Red List Authority for birds)
Tier 1 Latrodectus mactans — IUCN Red List (no assessment found) — IUCN Red List of Threatened Species
Tier 1 Hypanus americanus (Southern Stingray) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Aetobatus narinari (Spotted Eagle Ray) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Lucanus cervus (Stag Beetle) — Red List conservation status — IUCN Red List of Threatened Species
Tier 1 Acropora cervicornis (Staghorn coral) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Porphyrio hochstetteri (Takahē) — Red List Assessment — IUCN Red List of Threatened Species / BirdLife International (Red List Authority for birds)
Tier 1 Tardigrada (water bears) — IUCN Red List status (Not Evaluated) — IUCN Red List of Threatened Species
Tier 1 Sarcophilus harrisii (Tasmanian Devil) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Galeocerdo cuvier (Tiger Shark) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Panthera tigris (Tiger) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Gekko gecko (Tokay Gecko) — Red List status — IUCN Red List of Threatened Species
Tier 1 Sphenodon punctatus (Tuatara) — IUCN Red List status (Least Concern) — IUCN Red List of Threatened Species
Tier 1 Prosthemadera novaeseelandiae (Tui) — Red List Assessment — IUCN Red List of Threatened Species / BirdLife International (Red List Authority for birds)
Tier 1 Peripatoides novaezealandiae — Red List status — IUCN Red List of Threatened Species
Tier 1 Diomedea exulans (Wandering Albatross) — Species Factsheet — BirdLife International (IUCN Red List Authority for birds)
Tier 1 Gallirallus australis (Weka) — Red List Assessment — IUCN Red List of Threatened Species / BirdLife International (Red List Authority for birds)
Tier 1 Gorilla gorilla (Western Gorilla) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Rhincodon typus (Whale Shark) — Red List Assessment — IUCN Red List of Threatened Species
Tier 1 Ceratotherium simum (White Rhinoceros) — IUCN Red List conservation status — IUCN Red List of Threatened Species
Tier 1 Aedes aegypti — IUCN Red List status check — IUCN Red List of Threatened Species
Tier 1 Thinking chickens: a review of cognition, emotion, and behavior in the domestic chicken — Animal Cognition (Springer)
Tier 1 Common octopus (Octopus vulgaris) — Species profile — Marine Life Information Network, Marine Biological Association
Tier 1 State of North Atlantic Salmon — North Atlantic Salmon Conservation Organization (NASCO)
Tier 1 Axolotls: Meet the amphibians that never grow up — Natural History Museum, London
Tier 1 Earthworms — Natural History Museum — Natural History Museum, London
Tier 1 Garden spiders: the UK's orb weavers — Natural History Museum — Natural History Museum, London
Tier 1 What is a honey bee? — Natural History Museum — Natural History Museum, London
Tier 1 Finding love on the web — Natural History Museum, London
Tier 1 Western Atlantic Bluefin Tuna — NOAA Fisheries
Tier 1 Atlantic Cod — NOAA Fisheries
Tier 1 Atlantic Salmon (Protected) — Species Profile — NOAA Fisheries (U.S. National Oceanic and Atmospheric Administration)
Tier 1 Blue Whale: Conservation Management — NOAA Fisheries
Tier 1 Blue Whale | NOAA Fisheries — NOAA Fisheries
Tier 1 Common Bottlenose Dolphin: Conservation Management — NOAA Fisheries
Tier 1 Common Bottlenose Dolphin — NOAA Fisheries (National Oceanic and Atmospheric Administration)
Tier 1 Green Turtle — NOAA Fisheries (U.S. National Oceanic and Atmospheric Administration)
Tier 1 Humpback Whale — Species Directory — NOAA Fisheries (National Oceanic and Atmospheric Administration)
Tier 1 Leatherback Turtle — NOAA Fisheries (National Oceanic and Atmospheric Administration)
Tier 1 Killer Whale | NOAA Fisheries — NOAA Fisheries
Tier 1 Assessment of the American Flamingo distribution, trends, and important breeding areas — PLOS ONE
Tier 1 How Big is the Giant Squid? — Smithsonian Institution — Ocean (National Museum of Natural History)
Tier 1 Honey Bees — Bee Research and Pollination — USDA Agricultural Research Service
Tier 1 Gardening for Pollinators — United States Department of Agriculture, Forest Service
Tier 1 Soil Tech Note 10A — Earthworms — USDA Natural Resources Conservation Service
Tier 1 American Bullfrog (Lithobates catesbeianus) — Nonindigenous Aquatic Species Profile — U.S. Geological Survey
Tier 1 Healthy diet — World Health Organization
Tier 1 Yellow fever — Fact sheet — World Health Organization
Tier 1 Euphausia superba Dana, 1850 — World Register of Marine Species (WoRMS)
Tier 2 Psittacus erithacus (grey parrot) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Castor canadensis (American beaver) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Alligator mississippiensis (American alligator) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Lithobates catesbeianus (American Bullfrog) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Anax junius (Common Green Darner) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Turdus migratorius (American robin) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Blue crab (Callinectes sapidus) — Chesapeake Bay Field Guide — Chesapeake Bay Program
Tier 2 Thunnus thynnus (horse mackerel) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Gadus morhua (Cod) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Attacus atlas — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Python regius (Ball Python, Royal Python) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Toxotes jaculatrix (riflefish) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Lates calcarifer (Asian seabass) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Spongia officinalis Linnaeus, 1759 — WoRMS — World Register of Marine Species
Tier 2 Beadlet anemone (Actinia equina) — species profile — The Wildlife Trusts
Tier 2 Common mussel (Mytilus edulis) — Biology and Sensitivity Review — MarLIN — The Marine Life Information Network (Marine Biological Association)
Tier 2 Tiliqua scincoides (Common Bluetongue, Eastern Bluetongue, Northern Bluetongue, Eastern Blue-Tongued Lizard) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Bootlace worm (Lineus longissimus) — MarLIN — The Marine Life Information Network, Marine Biological Association of the UK
Tier 2 Ursus arctos (brown bear) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Pelecanus occidentalis (brown pelican) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Bradypus variegatus (brown-throated three-toed sloth) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 California Sea Cucumber — Seafood Profile — California Sea Grant, University of California San Diego
Tier 2 Rhinella marina (Cane Toad) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Carassius auratus — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Chamaeleo calyptratus (Veiled Chameleon) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Pan troglodytes (chimpanzee) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Andrias davidianus (Chinese giant salamander) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Amphiprion ocellaris (Clown anemonefish) — Animal Diversity Web — University of Michigan Museum of Zoology
Tier 2 Birgus latro (coconut crab) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Turdus merula (common blackbird) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Forficula auricularia (European earwig) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Photinus pyralis — Common Eastern Firefly — Animal Diversity Web (University of Michigan Museum of Zoology)
Tier 2 Rana temporaria — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Thamnophis sirtalis (Common Garter Snake) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Phalangium opilio — Animal Diversity Web (classification) — Animal Diversity Web (University of Michigan Museum of Zoology)
Tier 2 Bernhard's hermit crab (Pagurus bernhardus) — MarLIN — The Marine Life Information Network (Marine Biological Association)
Tier 2 Alcedo atthis (Eurasian kingfisher) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Struthio camelus (ostrich) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Gerris lacustris — Classification — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Common shore crab (Carcinus maenas) — MarLIN — The Marine Life Information Network (Marine Biological Association)
Tier 2 Bufo bufo — Classification — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Vombatus ursinus (coarse-haired wombat) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Pantherophis guttatus (Red corn snake) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Canis lupus dingo (dingo) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Felis catus (domestic cat) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Bos taurus (aurochs, domesticated cattle) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Canis lupus familiaris (dog) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Capra hircus (domestic goat) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Equus caballus (horse) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Sus scrofa (wild boar) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Ovis aries (mouflon / domestic sheep) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Anax imperator — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Aptenodytes forsteri (emperor penguin) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Pandinus imperator — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Eublepharis macularius (Common Leopard Gecko) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Dromaius novaehollandiae (emu) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Anguilla anguilla (Common eel) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Erinaceus europaeus (western European hedgehog) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Mantis religiosa — Classification — Animal Diversity Web (University of Michigan Museum of Zoology)
Tier 2 Oryctolagus cuniculus (European rabbit) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Erithacus rubecula (European robin) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Loligo vulgaris Lamarck, 1798 — Taxon Details — WoRMS — World Register of Marine Species (MolluscaBase eds.)
Tier 2 Gryllus campestris (Field Cricket) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Salamandra salamandra (fire salamander) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Chlamydosaurus kingii (Frilled Lizard) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Chelonoidis nigra — Animal Diversity Web — University of Michigan Animal Diversity Web
Tier 2 Myrmecophaga tridactyla (giant anteater) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Mobula birostris (giant manta ray) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Gymnothorax javanicus — Species Summary — FishBase (Froese, R. and D. Pauly, eds.)
Tier 2 Ailuropoda melanoleuca (giant panda) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Riftia Tubeworms — Smithsonian Ocean (Smithsonian National Museum of Natural History)
Tier 2 Giraffa camelopardalis (giraffe) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Phyllobates terribilis (Golden Poison Frog) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Theraphosa blondi — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Bubo virginianus (great horned owl) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Great scallop (Pecten maximus) — Biology and Sensitivity Review — MarLIN — The Marine Life Information Network (Marine Biological Association)
Tier 2 Parus major (great tit) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Iguana iguana (Common Green Iguana) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Strongylocentrotus droebachiensis (green sea urchin) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Canis lupus (gray wolf) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Diploria labyrinthiformis (Grooved brain coral) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Poecilia reticulata (Rainbow fish) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Phoca vitulina (harbor seal) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Dynastes hercules (Hercules beetle) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Hippopotamus amphibius (hippopotamus) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Passer domesticus (house sparrow) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Musca domestica (housefly) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Melanocetus johnsonii — Summary — FishBase
Tier 2 Strigops habroptilus (kakapo) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Kākā | Kaka — Nestor meridionalis — New Zealand Birds Online (Te Papa / Ornithological Society of New Zealand)
Tier 2 Nestor notabilis (kea) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Phascolarctos cinereus (koala) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Cyprinus carpio (common carp) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Atta cephalotes — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Panthera pardus (leopard) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Panthera leo (lion) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Loxodonta africana (African bush elephant) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Actias luna (luna moth) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Aix galericulata (Mandarin duck) — Animal Diversity Web, University of Michigan
Tier 2 Synchiropus splendidus (Mandarin-fish) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Hirudo medicinalis — Animal Diversity Web — Animal Diversity Web (University of Michigan Museum of Zoology)
Tier 2 Lycosa tarantula — Animal Diversity Web (classification) — Animal Diversity Web (University of Michigan Museum of Zoology)
Tier 2 Suricata suricatta (meerkat) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Brachypelma smithi (Mexican redknee tarantula) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Locusta migratoria — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Ruru | Morepork — Ninox novaeseelandiae — New Zealand Birds Online (Te Papa / Ornithological Society of New Zealand)
Tier 2 Maccullochella peelii (Murray cod) — Species Summary — FishBase
Tier 2 Cygnus olor (mute swan) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 New Zealand fantail | Pīwakawaka — Rhipidura fuliginosa — New Zealand Birds Online (Te Papa / Ornithological Society of New Zealand)
Tier 2 Kiwi — New Zealand native land birds — New Zealand Department of Conservation (Te Papa Atawhai)
Tier 2 Cardinalis cardinalis (northern cardinal) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Ginglymostoma cirratum — Animal Diversity Web — Animal Diversity Web (University of Michigan Museum of Zoology)
Tier 2 Mola mola (Ocean Sunfish) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Ophiophagus hannah (Hamadryad, King Cobra) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Vanessa cardui — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Manis pentadactyla (Chinese pangolin) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Furcifer pardalis — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Magicicada septendecim (Linnaeus' 17-year cicada) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Equus quagga — Animal Diversity Web — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Ornithorhynchus anatinus (duck-billed platypus) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Portuguese Man O'War (Physalia physalis) — species profile — The Wildlife Trusts
Tier 2 Pūkeko | Pukeko — Porphyrio melanotus — New Zealand Birds Online (Te Papa / Ornithological Society of New Zealand)
Tier 2 Procyon lotor (northern raccoon) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Oncorhynchus mykiss (Coast rainbow trout) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Pygocentrus nattereri (Redbelly piranha) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Agalychnis callidryas (Red-eyed tree frog) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Vulpes vulpes (red fox) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Pterois volitans (Red firefish) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Sciurus vulgaris (Eurasian red squirrel) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Buteo jamaicensis (red-tailed hawk) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Formica rufa — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Phidippus regius — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Lemur catta (ring-tailed lemur) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Archilochus colubris (ruby-throated hummingbird) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Columba livia (common pigeon) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Crocodylus porosus (Saltwater crocodile) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Sphyrna lewini (scalloped hammerhead shark) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Enhydra lutris (sea otter) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Tachyglossus aculeatus (short-beaked echidna) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Betta splendens (Siamese Fighting Fish) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Lissotriton vulgaris — Classification — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Latrodectus mactans — Animal Diversity Web — Animal Diversity Web (University of Michigan Museum of Zoology)
Tier 2 Casuarius casuarius (southern cassowary) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Dasyatis americana — Southern Stingray — Animal Diversity Web (University of Michigan Museum of Zoology)
Tier 2 Aetobatus narinari — Animal Diversity Web — Animal Diversity Web (University of Michigan Museum of Zoology)
Tier 2 Takahē — New Zealand native land birds — New Zealand Department of Conservation (Te Papa Atawhai)
Tier 2 Tardigrada (water bears) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Sarcophilus harrisii (Tasmanian devil) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Galeocerdo cuvier (tiger shark) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Panthera tigris (tiger) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Gekko gecko (Tokay Gecko) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Sphenodon punctatus (Tuatara) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Tui — New Zealand native land birds — New Zealand Department of Conservation (Te Papa Atawhai)
Tier 2 New Zealand peripatus / ngāokeoke: Invertebrates — New Zealand Department of Conservation (Te Papa Atawhai)
Tier 2 Diomedea exulans (wandering albatross) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Weka — Gallirallus australis — New Zealand Birds Online (Te Papa / Ornithological Society of New Zealand)
Tier 2 Ceratotherium simum — Animal Diversity Web — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Aedes aegypti — Classification — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 2 Sea Wasp — Australian Institute of Marine Science
Tier 2 Giant Pacific Octopus — Online Learning Center — Aquarium of the Pacific
Tier 2 Moon Jelly (Aurelia aurita) — Aquarium of the Pacific Online Learning Center — Aquarium of the Pacific
Tier 2 American Flamingo — National Audubon Society
Tier 2 Atlantic Puffin — Field Guide — National Audubon Society
Tier 2 Rainbow Lorikeet — Australian Museum
Tier 2 Banded Archerfish, Toxotes jaculatrix (Pallas, 1767) — Australian Museum
Tier 2 Chambered Nautilus — The Australian Museum — Australian Museum
Tier 2 Eastern Blue-tongue Lizard — The Australian Museum
Tier 2 Buff-tailed bumblebee (Bombus terrestris) — Bumblebee Conservation Trust
Tier 2 Gallus gallus domesticus — Galapagos Species Checklist — Charles Darwin Foundation
Tier 2 Blue Crabs — What's at Risk — Chesapeake Bay Program
Tier 2 American Robin Life History — Cornell Lab of Ornithology
Tier 2 Atlantic Puffin — Life History — Cornell Lab of Ornithology (All About Birds)
Tier 2 Bald Eagle Life History — Cornell Lab of Ornithology — All About Birds
Tier 2 American Barn Owl Life History — Cornell Lab of Ornithology — All About Birds
Tier 2 Brown Pelican Life History — Cornell Lab of Ornithology — All About Birds
Tier 2 Great Horned Owl Life History — Cornell Lab of Ornithology — All About Birds
Tier 2 Mallard — Overview, All About Birds — Cornell Lab of Ornithology
Tier 2 Integrated Fisheries Management Plan: Lobster in the Maritimes Region — Fisheries and Oceans Canada
Tier 2 Toxotes jaculatrix (Banded archerfish) — FishBase
Tier 2 Hippocampus kuda (Spotted seahorse) — FishBase Summary — FishBase
Tier 2 Paracanthurus hepatus, Palette surgeonfish — FishBase
Tier 2 Lates calcarifer — Fishes of Australia, Museums Victoria
Tier 2 Whale Shark — Animal Guide — Georgia Aquarium
Tier 2 Achatina fulica — Global Invasive Species Database — ISSG (Invasive Species Specialist Group), IUCN SSC
Tier 2 Crown-of-thorns starfish — Great Barrier Reef Foundation — Great Barrier Reef Foundation
Tier 2 Beadlet anemone (Actinia equina) — MarLIN — The Marine Life Information Network, Marine Biological Association of the UK
Tier 2 Seven-Spotted Lady Beetle — Missouri Department of Conservation
Tier 2 Clownfish — Animal Guide — Monterey Bay Aquarium
Tier 2 Giant Pacific and common octopus — species profile — Monterey Bay Aquarium
Tier 2 White Shark — Animal Guide — Monterey Bay Aquarium
Tier 2 Blue Crab — Species Directory — NOAA Fisheries
Tier 2 American Lobster — Species Directory — NOAA Fisheries
Tier 2 Monarch Butterfly — Wildlife Guide — National Wildlife Federation
Tier 2 Species Status Assessment: American Lobster — New York State Department of Environmental Conservation
Tier 2 Lion's Mane Jellyfish — Oceana
Tier 2 Orangutan Behavior — Orangutan Foundation International
Tier 2 Orangutan Ecology — Orangutan Foundation International
Tier 2 Stag beetles — People's Trust for Endangered Species
Tier 2 Cheetah | San Diego Zoo Animals & Plants — San Diego Zoo Wildlife Alliance
Tier 2 Kangaroo and Wallaby — San Diego Zoo Wildlife Alliance
Tier 2 Macaw — San Diego Zoo Wildlife Alliance
Tier 2 Asian Elephant — Animal Fact Sheet — Smithsonian's National Zoo and Conservation Biology Institute
Tier 2 Giant panda — Smithsonian's National Zoo and Conservation Biology Institute
Tier 2 Komodo dragon — Animal Fact Sheet — Smithsonian's National Zoo and Conservation Biology Institute
Tier 2 Lion — Smithsonian's National Zoo and Conservation Biology Institute
Tier 2 Snails and Slugs — Pest Notes (Cornu aspersum, brown garden snail) — University of California Statewide Integrated Pest Management Program (UC IPM)
Tier 2 The Monarch Butterfly in North America — US Forest Service (US Department of Agriculture)
Tier 2 Common cuttlefish — The Wildlife Trusts
Tier 2 Common starfish — The Wildlife Trusts
Tier 2 Lobster (Homarus gammarus) — The Wildlife Trusts
Tier 2 7-spot ladybird — The Wildlife Trusts
Tier 2 African elephants: Giants of the savanna and forest — World Wildlife Fund (WWF)
Tier 2 Bornean Orangutan — Species Profile — World Wildlife Fund (WWF)
Tier 2 Jaguar — World Wide Fund for Nature (WWF)
Tier 2 Cheetah — World Wildlife Fund (WWF)
Tier 2 Polar Bear — World Wildlife Fund (WWF)
Tier 2 Snow Leopard — World Wide Fund for Nature (WWF)
Tier 2 Western Lowland Gorilla — Species Profile — World Wildlife Fund (WWF)
Tier 3 Araneus diadematus — Animal Diversity Web — University of Michigan Museum of Zoology
Tier 3 Lumbricus terrestris — Animal Diversity Web — University of Michigan Museum of Zoology
Tier 3 Octopus vulgaris — Animal Diversity Web — University of Michigan Museum of Zoology
Tier 3 Paracanthurus hepatus (Flagtail surgeonfish) — Animal Diversity Web, University of Michigan Museum of Zoology
Tier 3 Chicken (bird) — Encyclopaedia Britannica
Tier 3 Electric Eel — National Geographic — National Geographic
Tier 3 Red-Eyed Tree Frog (Agalychnis callidryas) — Rainforest Alliance
Tier 3 Grey parrot — Wikipedia
Tier 3 American alligator — Wikipedia
Tier 3 North American beaver — Wikipedia (English)
Tier 3 American robin — Wikipedia
Tier 3 Callinectes sapidus — Wikipedia
Tier 3 Atlantic bluefin tuna — Wikipedia
Tier 3 Atlantic cod — Wikipedia
Tier 3 Bald eagle — Wikipedia
Tier 3 Banded archerfish — Wikipedia
Tier 3 Western barn owl — Wikipedia
Tier 3 Barramundi — Wikipedia
Tier 3 Spongia officinalis — Wikipedia
Tier 3 Beadlet anemone — Wikipedia
Tier 3 Blue mussel — Wikipedia
Tier 3 Tiliqua scincoides — Wikipedia
Tier 3 Lineus longissimus — Wikipedia
Tier 3 Brown pelican — Wikipedia
Tier 3 Brown-throated sloth — Wikipedia
Tier 3 Cane toad — Wikipedia
Tier 3 California sea cucumber — Wikipedia
Tier 3 Chinese giant salamander — Wikipedia
Tier 3 Coconut crab — Wikipedia
Tier 3 Common blackbird — Wikipedia
Tier 3 Forficula auricularia — Wikipedia
Tier 3 Photinus pyralis — Wikipedia
Tier 3 Common frog — Wikipedia
Tier 3 Common garter snake — Wikipedia
Tier 3 Phalangium opilio — Wikipedia
Tier 3 Pagurus bernhardus — Wikipedia
Tier 3 Common kingfisher — Wikipedia (Wikimedia Foundation)
Tier 3 Gerris lacustris — Wikipedia
Tier 3 Carcinus maenas — Wikipedia
Tier 3 Common toad — Wikipedia
Tier 3 Common wombat — Wikipedia
Tier 3 Dingo (Canis familiaris / Canis lupus dingo) — Wikipedia
Tier 3 Cattle (Bos taurus) — Wikipedia
Tier 3 Dog (Canis lupus familiaris) — Wikipedia
Tier 3 Goat (Capra hircus) — Wikipedia
Tier 3 Horse (Equus ferus caballus) — Wikipedia
Tier 3 Pig (Sus scrofa domesticus) — Wikipedia
Tier 3 Sheep (Ovis aries) — Wikipedia
Tier 3 Emperor dragonfly — Wikipedia
Tier 3 Emperor scorpion — Wikipedia, the free encyclopedia
Tier 3 Emu (Dromaius novaehollandiae) — Wikipedia
Tier 3 European eel — Wikipedia
Tier 3 European hedgehog — Wikipedia
Tier 3 European mantis — Wikipedia
Tier 3 European rabbit — Wikipedia
Tier 3 European robin — Wikipedia
Tier 3 European squid — Wikipedia
Tier 3 Gryllus campestris — Wikipedia
Tier 3 Fire salamander — Wikipedia (English)
Tier 3 Hydra vulgaris — Wikipedia
Tier 3 Frilled lizard — Wikipedia
Tier 3 Giant anteater — Wikipedia
Tier 3 Giant oceanic manta ray — Wikipedia
Tier 3 Giant moray — Wikipedia
Tier 3 Riftia pachyptila — Wikipedia
Tier 3 Golden poison frog — Wikipedia
Tier 3 Goliath birdeater — Wikipedia
Tier 3 Great horned owl — Wikipedia
Tier 3 Pecten maximus — Wikipedia
Tier 3 Great tit — Wikipedia
Tier 3 Green sea turtle — Wikipedia
Tier 3 Strongylocentrotus droebachiensis — Wikipedia
Tier 3 Diploria — Wikipedia
Tier 3 Guppy — Wikipedia
Tier 3 Hercules beetle — Wikipedia
Tier 3 House sparrow — Wikipedia
Tier 3 Housefly — Wikipedia
Tier 3 Humpback anglerfish — Wikipedia
Tier 3 Kākā — Wikipedia
Tier 3 Kākāpō — Wikipedia (Wikimedia Foundation)
Tier 3 Kea — Wikipedia
Tier 3 Atta cephalotes — Wikipedia
Tier 3 Luna moth — Wikipedia
Tier 3 Synchiropus splendidus — Wikipedia
Tier 3 Hirudo medicinalis — Wikipedia
Tier 3 Lycosa tarantula — Wikipedia
Tier 3 Migratory locust — Wikipedia
Tier 3 Morepork — Wikipedia
Tier 3 Murray cod — Wikipedia
Tier 3 New Zealand fantail — Wikipedia
Tier 3 North Island brown kiwi — Wikipedia
Tier 3 Northern cardinal — Wikipedia
Tier 3 Nurse shark — Wikipedia
Tier 3 Ocean sunfish — Wikipedia
Tier 3 Vanessa cardui — Wikipedia
Tier 3 Chinese pangolin — Wikipedia (English)
Tier 3 Panther chameleon — Wikipedia
Tier 3 Magicicada septendecim — Wikipedia
Tier 3 Platypus — Wikipedia (English)
Tier 3 Portuguese man o' war — Wikipedia
Tier 3 Australasian swamphen — Wikipedia
Tier 3 Raccoon (Procyon lotor) — Wikipedia
Tier 3 Rainbow trout — Wikipedia
Tier 3 Red-bellied piranha — Wikipedia, the free encyclopedia
Tier 3 Red lionfish — Wikipedia
Tier 3 Red squirrel — Wikipedia
Tier 3 Procambarus clarkii — Wikipedia
Tier 3 Red-tailed hawk — Wikipedia
Tier 3 Formica rufa — Wikipedia
Tier 3 Phidippus regius — Wikipedia
Tier 3 Rock dove — Wikipedia
Tier 3 Ruby-throated hummingbird — Wikipedia (Wikimedia Foundation)
Tier 3 Scalloped hammerhead — Wikipedia
Tier 3 Short-beaked echidna — Wikipedia (English)
Tier 3 Siamese fighting fish — Wikipedia
Tier 3 Smooth newt — Wikipedia
Tier 3 Latrodectus mactans — Wikipedia
Tier 3 Southern cassowary — Wikipedia
Tier 3 Southern stingray — Wikipedia
Tier 3 Spotted eagle ray — Wikipedia
Tier 3 Staghorn coral — Wikipedia
Tier 3 Takahē — Wikipedia
Tier 3 Tardigrade — Wikipedia
Tier 3 Tasmanian devil — Wikipedia (English)
Tier 3 Tiger shark — Wikipedia
Tier 3 Tokay gecko — Wikipedia, the free encyclopedia
Tier 3 Tuatara — Wikipedia
Tier 3 Tūī — Wikipedia
Tier 3 Peripatoides novaezealandiae — Wikipedia
Tier 3 Snowy albatross (Wandering albatross) — Wikipedia
Tier 3 Weka — Wikipedia
Tier 3 Aedes aegypti — Wikipedia
Tier 3 African bush elephant — Wikipedia
Tier 3 American flamingo — Wikipedia
Tier 3 Antarctic krill (Euphausia superba) — Wikipedia
Tier 3 Asian elephant — Wikipedia
Tier 3 Atlantic puffin — Wikipedia
Tier 3 Atlantic salmon — Wikipedia
Tier 3 Attacus atlas — Wikipedia
Tier 3 Aurelia aurita — Wikipedia — Wikipedia
Tier 3 Ball python — Wikipedia
Tier 3 Blue whale — Wikipedia
Tier 3 Bornean orangutan — Wikipedia
Tier 3 Brown bear — Wikipedia
Tier 3 Bombus terrestris — Wikipedia
Tier 3 Chambered nautilus — Wikipedia — Wikipedia
Tier 3 Cheetah — Wikipedia
Tier 3 Chimpanzee — Wikipedia
Tier 3 Chironex fleckeri — Wikipedia — Wikipedia
Tier 3 Common bottlenose dolphin — Wikipedia
Tier 3 Common cuttlefish (Sepia officinalis) — Wikipedia
Tier 3 Common ostrich — Wikipedia
Tier 3 Common starfish (Asterias rubens) — Wikipedia
Tier 3 Corn snake — Wikipedia
Tier 3 Cornu aspersum — Wikipedia — Wikipedia
Tier 3 Crown-of-thorns starfish — Wikipedia — Wikipedia
Tier 3 Cyprinus rubrofuscus — Wikipedia
Tier 3 Cat — Wikipedia
Tier 3 Electric eel — Wikipedia — Wikipedia
Tier 3 Homarus gammarus (European lobster) — Wikipedia
Tier 3 Galápagos tortoise — Wikipedia
Tier 3 Lissachatina fulica — Wikipedia
Tier 3 Giant squid — Wikipedia — Wikipedia
Tier 3 Giraffe — Wikipedia
Tier 3 Goldfish — Wikipedia
Tier 3 Green darner — Wikipedia
Tier 3 Green iguana — Wikipedia
Tier 3 Wolf — Wikipedia (Wikimedia Foundation)
Tier 3 Harbor seal — Wikipedia
Tier 3 Hippocampus kuda — Wikipedia — Wikipedia
Tier 3 Humpback whale — Wikipedia
Tier 3 Jaguar — Wikipedia (English)
Tier 3 King cobra — Wikipedia
Tier 3 Koala — Wikipedia (Wikimedia Foundation)
Tier 3 Koi — Wikipedia
Tier 3 Komodo dragon — Wikipedia
Tier 3 Leatherback sea turtle — Wikipedia
Tier 3 Leopard gecko — Wikipedia
Tier 3 Lion's mane jellyfish — Wikipedia
Tier 3 Mallard — Wikipedia
Tier 3 Mandarin duck — Wikipedia
Tier 3 Monarch butterfly — Wikipedia
Tier 3 Orca — Wikipedia
Tier 3 Paracanthurus — Wikipedia — Wikipedia
Tier 3 Peregrine falcon — Wikipedia — Wikipedia (Wikimedia Foundation)
Tier 3 Plains zebra — Wikipedia — Wikipedia (Wikimedia Foundation)
Tier 3 Polar bear — Wikipedia
Tier 3 Rainbow lorikeet — Wikipedia
Tier 3 Agalychnis callidryas — Wikipedia
Tier 3 Ring-tailed lemur — Wikipedia
Tier 3 Saltwater crocodile — Wikipedia
Tier 3 Scarlet macaw — Wikipedia
Tier 3 Sea otter — Wikipedia (English)
Tier 3 Coccinella septempunctata — Wikipedia
Tier 3 Snow leopard — Wikipedia (English)
Tier 3 Lucanus cervus — Wikipedia
Tier 3 Tiger — Wikipedia (Wikimedia Foundation)
Tier 3 Veiled chameleon — Wikipedia
Tier 3 Western gorilla — Wikipedia
Tier 3 White rhinoceros — Wikipedia — Wikipedia (Wikimedia Foundation)
Tier 3 Garden spider — The Wildlife Trusts — The Wildlife Trusts
Tier 4 American lobster — Wikipedia
Tier 4 Giant Pacific octopus — Wikipedia
Tier 4 Whale shark — Wikipedia