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of vertebrate animals characterized by the presence of hair (or fur ) and mammary glands , which in females produce milk for the nourishment of young. the other extant (living) classes of vertebrates (animals with backbones) include fish (with a few recognized classes), amphibians , reptiles , and birds
. like birds, mammals are endothermic or " warm-blooded ," and have four-chambered hearts. mammals also have a diaphragm, a muscle below the rib cage that aids breathing. some other vertebrates have a diaphragm, but mammals are the only vertebrates with a prehepatic diaphragm, that is, in front of the...
https://www.newworldencyclopedia.org/entry/Mammal