The kangaroo is a marsupial of the macropodidae family typical of the Australian continent. Strictly speaking, the name kangaroo refers to one of the members of the four largest living species of macropodids ("big feet"): the red kangaroo, the giant kangaroo, the gray kangaroo and the antelope kangaroo. In the broad sense, it brings together the 63 largest living species of the macropodidae family. In addition to the previous species, we add wallaroos, wallabies, tree kangaroos, pademelons and quokka. They are found, in the wild, exclusively in Australia (on the continent and in Tasmania), as well as in New Guinea for tree kangaroos [ref. required] [note 1]. Australia's kangaroos are estimated to number fifty million. Kangaroos are nocturnal. The tail of the kangaroo serves as a tripod at rest, and as a balance when it jumps: this locomotion is called "crawl-walking"
