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many animals, including crocodiles, it reaches a zenith in birds and mammals. among the primates , human mothers spend more time with their infants than any other species. there are three major subdivisions of mammals: monotremes , marsupials , and placentals . monotremes are mammals that lay eggs ,
a defining feature of mammals, since this trait is shared with birds . however, the presence of hair is a unique mammalian characteristic. this filamentous outgrowth of the skin projects from the epidermis, though it grows from follicles deep in the dermis. in non-human species, hair is commonly referred...
https://www.newworldencyclopedia.org/entry/Mammal