Group of marsupials. From left to right, top to bottom: tree kangaroo, numbat, wombat, koala, kangaroo, phalanger, tasmanian devil. Marsupials are an infraclass of mammals living primarily in Australasia and the Americas. A distinctive characteristic, common to most species, is that the young are carried in a pouch. Well-known marsupials include kangaroos, wallabies, the koala, possums, opossums, wombats and the Tasmanian devil. Taken from "Johnson's household book of nature, containing full and interesting descriptions of the animal kingdom, based upon the writings of the eminent naturalists, Audubon, Wallace, Brehm, Wood and others" edited by Hugh Craig, published 1880.