A crocodile's tongue doesn't move. It is held in place at the roof of the mouth by a membrane. Because crocodiles spend so much time underwater, the tongue helps keep the throat closed, protecting the animal's airway.
Why can't a crocodile stick out its tongue? Crocs have a membrane that holds their tongue in place on the roof of their mouth so it doesn't move. This makes it impossible for them to stick it outside of their narrow mouths, according to the BBC.
Their tongues are not free, but held in place by a membrane that limits movement; as a result, crocodiles are unable to stick out their tongues.
Alligators' tongues sit in their lower mouths and run the full length of the lower jaw, making them nearly the same length as their long snouts – and an adult male alligator could have a snout up to two feet long.
gaping
Why do alligators and crocodiles often sit with their mouths open? This behaviour is called gaping and is done when the crocodilian is basking in the sun. Experts think that this may cool the crocodilian. However they also do this during rain and at night which suggests that gaping has a social function as well.
Crocodile Tongues
A crocodile's tongue doesn't move. ... Because crocodiles spend so much time underwater, the tongue helps keep the throat closed, protecting the animal's airway. Unlike other species, the tongue plays no part in feeding.
Bullfrogs
Bullfrogs… No rest for the Bullfrog. The bullfrog was chosen as an animal that doesn't sleep because when tested for responsiveness by being shocked, it had the same reaction whether awake or resting. However, there were some problems with how the bullfrogs were tested.
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