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 and 29 genera. The six families are: Pteropodidae, Emballonuridae, Hipposideridae, Rhinolophidae, Vespertilionidae and Molossidae. Bats migrated to New Guinea on many different occasions, with many species being shared with Australia, the Sunda Islands and even mainland Asia. The megabats, or Megachiropterans, of New Guinea are highly adapted, and many are endemic to New Guinea and surrounding islands. While most megabats are herbivorous, and eat fruit, nectar and flowers, some species within New Guinea have adapted to also eat insects whilst in flight; an ecological niche usually filled by microbats. Some species also forage on the ground, an adaptation not seen