Snakes smell by flicking their tongues and carrying scent particles to a special organ.

The longer version

A forked tongue collects invisible chemical traces from air, soil or water and delivers them to the vomeronasal organ, a pair of sensory chambers in the roof of the mouth. Tiny pits there house receptor cells tuned to particular molecules.

The forked shape is the clever part. Because the two tips sample slightly different points, the snake can compare concentration between left and right and steer toward the stronger side, much as stereo hearing locates a sound. Flicking constantly refreshes the sample without the animal having to open its mouth wide or inhale loudly, which matters for a predator that relies on stealth.

Where this entry sits

This collection gathers small surprises about mammals, reptiles, amphibians, birds, fish, insects, and the pets living alongside people. Expect odd details about senses, anatomy, and everyday behaviour that many people never notice in the animals around them. The full list sits on the Animals page, where every entry is listed in order.