Cat
Cats are the only animals that purr. Purring doesn't necessarily mean a cat is happy. Sometimes cats will purr when they are scared or hurt.
A cat's nose pad is as unique as a human fingerprint. No two nose prints are identical. A litter of kittens is called a kindle & a group of cats is called a clowder. A cat's hearing is much more sensitive than a dog's or ours. Cats have 32 muscles in each ear. They can turn their ear very quickly to pick up noise.