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
Law of Papua New Guinea Australia, the Judicial Committee of the Imperial Privy Council, not being part of the common law of England, and indeed of the pre-independence courts of Papua New Guinea itself are not part of Papua New Guinea law; but decisions of the House of Lords, the English Court of Appeal, the English Queen's Bench and other English courts up until Papua New Guinea's independence are. The "customary law" portion of the "underlying law" was contemplated by the original framers of the Constitution as deriving from the regional customs of the country in the same way as the common law of England