Lions have backward-curved horny papillae that cover the upper surface of the tongue. These are useful both in holding onto meat and removing parasites during grooming.
Cheetah
Unlike other cats, Cheetahs can only partially retract their claws which are not covered by sheaths. The Cheetah's scientific name, Acinonyx comes from the Greek words "akaina" meaning 'thorn' and "orux" which means 'claw'.
