A housefly tastes food with its feet before deciding whether to eat it.

The longer version

Foot contact tells a housefly whether something is worth eating, because sensory bristles on the legs respond to sugars and other soluble substances. Merely walking over a surface can trigger the response, extending sponge-like mouthparts to mop up liquid. The taste organs sit near the ground, which suits an animal feeding on spills.

Flies cannot chew, so they must find already-liquid food or liquefy it first. Needing to land explains the restless hopping between surfaces while sampling. Constant movement also means particles picked up on legs and body get deposited wherever the insect next settles.

Where this entry sits

This collection gathers small wonders from the world of ants, bees, butterflies, beetles, and spiders. Expect surprising details about swarms, silk, and metamorphosis, plus the strange everyday abilities of creatures small enough to fit on a fingertip. The full list sits on the Insects and Spiders page, where every entry is listed in order.