Which animal cannot stick its tongue out?

No but they have really big mouths & lots of teeth! I give them the respect that they deserve!

its good they cannot extend their tongue or else they can easily get a victim

I have never given much thought to animals' tongues, except wolves and dogs. They actually make a little spoon out of the end of their tongue when they drink. You can see footage on YouTube taken with a high-speed camera. It's pretty cool.

I saw crocodiles at the Academy of Sciences in San Francisco.

Hanora, same

Wow, did not know that. I thought it was the elephant.