A mammal has lungs and breathes in oxygen and gives off carbon dioxide. Reproduction A mammal reproduces sexually with the female being fertilized by the male internally. Mammals have live birth and care for their young for quite a time after birth. Excretion A mammal gas kidneys and is covered with skin. The skin has hair.
Mammals are warm blooded.
A mammal has bilateral symmetry. A mammal can be various shades of brown, black, tan, white.