Hear Me Purr?

Lions roar, but cheetahs can only meow and purr.  

Weighing in at up to 150 pounds, cheetahs are the world's fastest land mammal. They can accelerate from 0 to 60 miles an hour in only three seconds, striking prey in the blink of an eye. But fearsome as they may be, there is something they can't do: Roar. Nope, cheetahs meow like a housecat. And, unlike their roaring cousins, cheetahs also have the ability to purr.  --- TreeHugger