Kangaroo: Kangaroo, any of six large species of Australian marsupials noted for hopping and bouncing on their hind legs. The term kangaroo, most specifically used, refers to the eastern gray kangaroo, the western gray kangaroo, and the red kangaroo, as well as to the antilopine kangaroo and two species of wallaroo.. The site of the kangaroo feast is not nearly that old, with most of the artifacts spanning the last Ice Age, between 18,000 and 28,000 years ago. — jason daley, Smithsonian, "Archaeologists Uncover 20,000-Year-Old Kangaroo Cook Out," 31 May 2018.