Papua New Guinea notable feature in common for the two landmasses is the existence of several species of marsupial mammals, including some kangaroos and possums, which are not found elsewhere. Papua New Guinea is a megadiverse country. Many of the other islands within PNG territory, including New Britain, New Ireland, Bougainville, the Admiralty Islands, the Trobriand Islands, and the Louisiade Archipelago, were never linked to New Guinea by land bridges. As a consequence, they have their own flora and fauna; in particular, they lack many of the land mammals and flightless birds that are common to New Guinea and Australia. Australia and New
Fauna of New Guinea in the forested regions of New Guinea. In areas where it has established, native animal populations have dramatically decreased. New Guinea has a rich biodiversity of bird life, with over 79 families and approximately 730 species that can be classified into four groups: breeding land and freshwater species, seabirds, migrants from the north, and migrants and vagrants from Australia and New Zealand. There are eight Endemic Bird Areas with about 320 endemic bird species in New Guinea. The largest birds in New Guinea are the flightless cassowaries, of which all three species are native to New Guinea. Two of these