Why do snakes flick their tongue?

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Do you feel frightened when snakes flick their tongue? Although it is frightening, it is a natural behaviour for snakes to flick their tongue. Snakes flick their tongue to gather information from their surroundings to deliver to their sensory organ in their mouth. Snakes do have nostrils as humans do, however, snakes use their nostrils only to draw air into their lungs.