Definition
An instance of BiologicalClass, and a sub-taxon of Vertebrate. Each instance of Mammal is an air-breathing, warm-blooded animal which, if female, nurses its young with milk secreted by mammary glands. The skin of instances of Mammal is typically covered with hair (or sometimes hair modified into scales or plates, as in pangolins), but some types are almost hairless. All mammals other than the Monotremes of Australia bear live young rather than laying eggs, and have teats, which on females are used for nursing the young. Monotremes do not have teats, but both male and female produce milk from mammary glands.
