Why Do Snakes Always Stick Their Tongues Out?

The snake has a thin, long and branched tongue, which is different from a person's tongue. The snake's tongue can help smell. Because the small nasal organ of the snake is inside the mouth, the snake must stick out its tongue, draw the fragrant and foul smells to the tongue and send it back to a special smell organ made the mouth. So in order to look for food and to judge the environmental conditions, snakes stick out their tongues to scent about.