Crocodiles can stick out their tongue.

Crocodiles cannot stick out their tongues because their tongues are attached to the floor of their mouth by a membrane. This is an anatomical adaptation that prevents the tongue from obstructing the throat when the crocodile is underwater or when catching prey. This attachment is a key difference between crocodilians and other reptiles. The tongue helps seal the throat, allowing crocodiles to open their mouths underwater without drowning.