* Hair or fur: Chimpanzees have hair covering their bodies, a defining feature of mammals.
* Give birth to live young: Chimpanzees, like other mammals, give birth to live offspring instead of laying eggs.
* Mammary glands: Female chimpanzees have mammary glands that produce milk to nourish their young.
* Warm-blooded: Chimpanzees, like all mammals, maintain a constant body temperature, which is independent of the environment.
* Three middle ear bones: This is a unique characteristic of mammals, and chimpanzees possess these bones.
* Specialized teeth: Chimpanzees have specialized teeth for chewing, including incisors, canines, premolars, and molars.
* Four-chambered heart: Like other mammals, chimpanzees have a four-chambered heart that efficiently circulates blood throughout the body.
These are just some of the key traits that make chimpanzees, and all other members of the class Mammalia, distinct from other animal groups.