The terms "kangaroo", "wallaroo", and "wallaby" all refer to members of the same taxonomic family, Macropodidae, and the genus Macropusincludes some wallaroos and wallabies. The largest species in the family are called "kangaroos", the smallest are generally called "wallabies", and the rest are termed "wallaroos".[3]
Kangaroos have large, powerful hind legs, large feet adapted for leaping, a long muscular tail for balance, and a small head. Like mostmarsupials, female kangaroos have a pouch called a marsupium in which joeys complete postnatal development.