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
Postage stamps and postal history of Papua New Guinea its stamps between 1888 and 1897. The colony got stamps bearing its name after 1897. Consequently, to the Australian conquest in 1914, the remaining German colonial stamps and some Australian ones, were overprinted. After the Territory of New Guinea became a League of Nations mandate entrusted to Australia, this country organised the postal system and philatelic production in New Guinea. After the Japanese occupation of New Guinea and the suppression of civil administration in Papua at the beginning of 1942, the stamps of Australia were used between 1945 and 1953, before the two united territories got their own stamps. Progressively,