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
Economy of Papua New Guinea Singapore (5.6%). In 2014, Papua New Guinea's merchandise imports were: Major source countries for merchandise imports include Australia (34.4%), Singapore (14.3%), the European Union (8.3%), China (6.9%), and Japan (6.4%). Petroleum, mining machinery and aircraft have been the primary U.S. exports to Papua New Guinea. In 1999, as mineral exploration and new minerals investments declined, as did United States exports. Crude oil is the largest U.S. import from Papua New Guinea, followed by gold, cocoa, coffee, and copper ore. U.S. companies are active in developing Papua New Guinea's mining and petroleum sectors. Chevron operates the Kutubu and Gobe oil projects