The purring sound is caused by the vibration of the cat s vocal cords.
Of course when we think of "cat", we usually mean only the domesticated cat. But there are many other members of the cat family. Did you know that the lion, tiger, leopard, cougar, jaguar, ocelot, and lynx are also members of the cat family?
When it comes to making sounds, our own domesticated cat not only purrs, it can also meow, howl, and scream. The other kinds of cats make different sounds. The lion and tiger can roar. The jaguar and leopard make a sound that is described as a hoarse cough or bark.
But an interesting thing about the lion, tiger, jaguar, and leopard is that because of a difference in the formation of certain bones in the throat, they cannot purr!
But all cats, large or small, have-the same general proportions of the body. If you blew up a picture of a cat to a very large size, you would see that it looks very much like a tiger.