Why do snakes flick their tongues so often?

A snake's forked tongue is not for tasting food in the human sense, but for chemically sampling its surroundings. When the tongue flicks out, it picks up molecules and transfers them to the vomeronasal system, including Jacobson's organ, which processes smell-like information. The forked shape helps the snake compare left and right signals and figure out where a scent is coming from. This is especially useful for tracking prey, mates, and predators. It is one of the most important senses in snake behavior and survival.