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 turtle ("Chelodina parkeri"), is restricted to the Fly River. The saltwater crocodile ("Crocodylus porosus") is the largest reptile native to New Guinea. It is a widely distributed species, from eastern India to northern Australia. It is found in most of New Guinea's rivers, except for those heavily disturbed by humans, or too small to accommodate the species. The other crocodile native to New Guinea, the New Guinea crocodile ("Crocodylus novaeguineae"), is an endemic. It is much smaller than the saltwater crocodile. A separate species may occur in southern New Guinea. New Guinea is within the Coral Triangle, the most species