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
Territory of Papua and New Guinea Under Australian Minister for External Territories Andrew Peacock, the territory adopted self-government in 1972. 1972 elections saw the formation of a ministry headed by Chief Minister Michael Somare, who pledged to lead PNG to self-government and then to independence. Following the passage of the Papua New Guinea Independence Act 1975, during the term of the Whitlam Government in Australia, the Territory became the Independent State of Papua New Guinea and attained independence on 16 September 1975. Territory of Papua and New Guinea The Territory of Papua and New Guinea was established by an administrative union between the Australian-administered territories of