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
Fauna of New Guinea rich marine region in the world. In addition to more than 600 species of corals (about 76% of the total in the world), there are more than 2200 species of reef fishes (about 37% of the total in the world). , about 375 species of fishes are known from freshwater habitats in New Guinea. Of these, 217 are strictly freshwater and 149 are endemic to New Guinea. In general, there is a strong connection in the fauna of New Guinea and Australia, and 33 freshwater fish species from New Guinea are also found in northern Australia. The most speciose families