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Awasome Do All Mammals Have Fur Or Hair References . Human hair might be useful for keeping the hot sun off our head and neck, but it doesn't do much to keep us warm. The mammal class is defined by the presence of mammary glands and hair (or fur). Why Do Animals Have Fur? from www.willyswilderness.org Web the normal length of the hair is an individual and species specific trait. Hairs grow out of pits in the skin called follicles. Web a mammal (from latin mamma 'breast') [1] is a vertebrate animal of the class mammalia ( / məˈmeɪli.ə / ).