Any animal of the Mammalia class, a class of warm-blooded vertebrates having a thoracic diaphragm, a four-chambered heart and in which the females feed the young with their own milk.
Relating or pertaining to mammals.
of or relating to the class Mammalia
any warm-blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milk
