<P> 4 species, see text . </P> <P> The kangaroo is a marsupial from the family Macropodidae (macropods, meaning "large foot"). In common use the term is used to describe the largest species from this family, especially those of the genus Macropus: the red kangaroo, antilopine kangaroo, eastern grey kangaroo, and western grey kangaroo . Kangaroos are endemic to Australia . The Australian government estimates that 34.3 million kangaroos lived within the commercial harvest areas of Australia in 2011, up from 25.1 million one year earlier . </P> <P> As with the terms "wallaroo" and "wallaby", "kangaroo" refers to a polyphyletic grouping of species . All three refer to members of the same taxonomic family, Macropodidae, and are distinguished according to size . The largest species in the family are called "kangaroos" and the smallest are generally called "wallabies". The term "wallaroos" refers to species of an intermediate size . There is also the tree - kangaroo, another genus of macropod, which inhabits the tropical rainforests of New Guinea, far northeastern Queensland and some of the islands in the region . A general idea of the relative size of these informal terms could be: </P> <Ul> <Li> wallabies: head and body length of 45--105 cm and tail length of 33--75 cm; The dwarf wallaby (the smallest member) length is 46 cm and weigh of 1.6 kg; </Li> <Li> tree - kangaroos: from Lumholtz's tree - kangaroo body and head length of 48--65 cm, tail of 60--74 cm, weigh of 7.2 kg (16 lb) for males and 5.9 kg (13 lb) for females; to the grizzled tree - kangaroo length of 75--90 cm (30 to 35 in) and weight of 8--15 kg (18--33 lb); </Li> <Li> wallaroos: the black wallaroo, the smallest by far, with a tail length of 60--70 cm and weight of 19--22 kg for males and 13 kg for females; </Li> <Li> kangaroos: a large male can be 2 m (6 ft 7 in) tall and weigh 90 kg (200 lb). </Li> </Ul>

Where does the name of kangaroo come from