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
Australia–Papua New Guinea relations Somare being barred from entering Australia. In 2001, relations were very good. A detention center was built on Manus Island, in Papua New Guinea, as part of Australia's "Pacific Solution". Refugee claimants seeking asylum in Australia were sent to Manus Island (or Nauru), and Australia paid for the costs of their detention, providing Papua New Guinea with economic aid. The last inmate was Aladdin Sisalem, who was kept in solitary confinement from July 2003 until he was finally granted asylum in Australia in June 2004. Australia continued to pay for the upkeep of the empty detention center until late 2007.