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
New Guinea New Guinea New Guinea (; ; ; , historically, "") is a large island off the continent of Australia. It is the world's second-largest, after Greenland, covering a land area of , and the largest wholly or partly within the Southern Hemisphere and Oceania. The eastern half of the island is the major land mass of the independent state of Papua New Guinea. The western half, referred to as either Western New Guinea or West Papua, has been administered by Indonesia since 1962 and comprises the provinces of Papua and West Papua. The island has been known by various names: