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 New Guinea The number of higher taxa falls with greater distance from New Guinea, with the age of island groups In some. The insect faunas of New Guinea and New Zealand interchanged through New Caledonia not Australia. There is no comprehensive overview on the insect fauna of New Guinea but a bibliography is available There may be 300,000 - 100,000 species and Papua New Guinea ranks 12th in the world in terms of endemism of large butterflies. The Papua Insects Foundation provides an expert resource Notable endemic insect species include "Ornithoptera paradisea", "Ornithoptera chimaera", "Papilio weymeri", "Graphium weiskei", "Ideopsis hewitsonii",