Crocodiles don't swallow stones out of appreciation for the taste. They do it because the stones help with basic digestion, according to the Miami Science Museum. Rocks in a crocodile's stomach help crush and grate food. Rock swallowing is especially beneficial for crocodiles who eat whole prey, particularly animals with shells and tough bones. A gastrolith can remain inside the stomach for years. Apart from making the digestion process go a little bit smoother, stone swallowing also can a crocodile feel heavier and fuller, according to some scientists. That can be useful for a crocodile who's not getting enough to eat.
