A cow's tongue is an amazing body part.
A cow only has front teeth on the bottom of their mouth - the top is a hard pad, but no teeth. So in order to eat grass, a cow can't bite it off like a horse, but they must rip it off with their tongue.
A cow's tongue is very rough-nearly like sandpaper. When a cow has an itch, she will use her tongue to scratch it.
Cows use their tongues for other things too -like licking their calves dry at birth or cleaning out their nose.