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 de Menezes came upon the principal island "Papua". In 1545, the Spaniard Iñigo Ortiz de Retes gave the island the name "New Guinea" because of what he saw as a resemblance between the islands' inhabitants and those found on the African Guinea coast. Knowledge of the interior of the island remained scant for several centuries after these initial European encounters. In 1884, Germany formally took possession of the northeast quarter of the island and it became known as German New Guinea. In 1884, a British protectorate was proclaimed over Papua – the southern coast of New Guinea. The protectorate, called