Mammals are the vertebrates within the class Mammalia , from Latin mamma `` breast '' .
Cohort Placentalia } } Mammals are the vertebrates within the class Mammalia ( from , 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 .
Mammal