Mammal | Info

Mammals are the vertebrates within the class Mammalia ( / m ə ˈ m eɪ l i ə / from Latin mamma "breast"), a clade of endothermic amniotes distinguished from reptiles (including birds ) by the possession of a neocortex (a region of the brain), hair , three middle ear bones , and mammary glands . Females of all mammal species nurse their young with milk , secreted from the mammary glands.