Housefly

The housefly is a small, everyday insect with a big story to tell. It is only about the size of a grain of rice, with a soft grey body and clear, delicate wings. Houseflies live almost everywhere in the world that people do, buzzing through towns, farms, and gardens. They are so ordinary that we hardly look at them — but up close, a housefly is a tiny marvel.

Take its eyes. A housefly has two enormous compound eyes, each one made of thousands of little lenses packed together, giving it a wide, wraparound view. Best of all, a fly sees movement in super-fast slow motion, spotting things about seven times quicker than we can. That is the real reason a fly zips away just as your hand swings in for a swat.

Now for the strangest trick of all: a housefly tastes with its feet. Tiny taste hairs on the bottoms of its legs let it check whether something is good to eat simply by walking on it. When it finds a treat, it dabs at the food with a soft, spongy mouth and sips it up, because a fly can only drink its meals, never chew them.

Houseflies are also brilliant fliers. Where most insects have four wings, a fly has just one pair for flying. Its second pair shrank long ago into two little drumstick-shaped parts called halteres, which whirl about and work like tiny balancers, keeping the fly steady as it loops, hovers, and lands upside down on the ceiling.

Nobody gives the common housefly an official conservation grade, so its status is “not evaluated” — which is normal for such an everyday insect. There are plenty of houseflies all around the world, and each one is a busy, clever little flier worth stopping to admire.