Mammals give birth to live young (not eggs), have mammary glands in females, have hair, and a neocortex (a region of the brain). They also have a four-chambered heart.
Mammals give birth to live young (not eggs), have mammary glands in females, have hair, and a neocortex (a region of the brain). They also have a four-chambered heart.
Mammals give birth to live young (not eggs), have mammary glands in females, have hair, and a neocortex (a region of the brain). They also have a four-chambered heart.