Not only can cats hear better than people, they can see better at night, too. Cats' eyes are designed for hunting and can adjust to light changes quickly. Even though some people think they can, cats cannot see in total darkness. Some of the members of the cat family can do what no other animals can do - purr. People aren't exactly sure how or why smaller cats, such as the cougar and house cat, make a purring sound.
Most people think that cats purr because they are content, but cats purr when they are in pain, too.
Big cats such as lions, tigers, jaguars and leopards don't purr like the smaller cats. Big cats have mighty roars. Cats that roar instead of purr are classified as big cats. Like other animals, cats have babies. Pet cats have babies called kittens.