Crocodile cannot stick out its tongue because it is held in place by a stiff membrane that anchors it to the floor of the mouth. This is not just an odd peculiarity with no function; it has important evolutionary advantages. First, it keeps the animal from hurting itself—when closing its jaws to crush its prey with over 3,700 psi, it’s good that the tongue is held in so it can’t be bitten off. It’s also important when hunting underwater—on the back of the tongue is a valve that shuts off the throat so the animal can open its mouth without water rushing into its lungs.
Tortoise — can slightly move its tongue
Hangul (a type of deer) — can move its tongue
Turtle — can move its tongue
Quick Info: A tortoise moves about on land with a dome-shaped shell, while a turtle lives in the water with a flat shell.