Mammals belong to Kingdom Mammalia and are distinguished from reptiles by the possession of a neocortex .
Mammals are any vertebrates within the kingdom Mammalia , 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 .
Mammal