A Crocodile Cannot Stick Its Tongue Out

While many reptiles, like snakes and lizards, are famous for their flicking tongues, the crocodile's tongue is surprisingly stationary. It is held fast to the floor of its mouth by a restrictive membrane of tissue. This isn't an evolutionary oversight but a critical adaptation for a predator (Review) with such a violent feeding style. When a crocodile clamps down with immense force and begins its powerful "death roll" to subdue prey, this anchored tongue is protected from being bitten, torn, or otherwise shredded in the chaos.

This unique anatomy serves another vital purpose for these semi-aquatic hunters. The membrane is part of a larger structure known as a palatal valve, a fleshy seal at the back of the throat. This valve allows a crocodile to open its mouth underwater to catch prey without water flooding into its throat and lungs, preventing it from drowning. It can hold a struggling animal in its jaws while remaining submerged, breathing comfortably through its nostrils which stay above the water (Review). This remarkable feature is a key component of what makes the crocodile such a successful and enduring aquatic ambush predator.