Any one of numerous species of jumping marsupials of the
   family Macropodidae. They inhabit Australia, New Guinea, and adjacent
   islands, They have long and strong hind legs and a large tail, while
   the fore legs are comparatively short and feeble. The giant kangaroo
   (Macropus major) is the largest species, sometimes becoming twelve or
   fourteen feet in total length. The tree kangaroos, belonging to the
   genus Dendrolagus, live in trees; the rock kangaroos, of the genus
   Petrogale, inhabit rocky situations; and the brush kangaroos, of the
   genus Halmaturus, inhabit wooded districts. See Wallaby.