Fauna of New Guinea Guinea. However, the tree-kangaroos, which are mostly endemic to New Guinea, are different in appearance and behaviour. As suggested by their name, they are arboreal. They have long, thick tails which enable them to balance in trees, and large, strong forearms for gripping to trees. Two species of tree kangaroos are also found in Australia, they are believed to have migrated from New Guinea during the Pleistocene. The cuscus, family Phalangeridae, are a family of marsupials closely related to the possums of Australia. The cuscus have evolved in New Guinea, and are found throughout the island. Most species are dark
Fauna of New Guinea frog found throughout New Guinea. "Lechriodus" is the only myobatrachid genus with greater diversity in New Guinea than Australia. Excluding "Lechriodus", the rest of the myobatrachids are mostly restricted to savannah in the southern Fly and Digul River plains. Tree frogs, of the family Hylidae, have successfully inhabited New Guinea. They are the most diverse family of frogs in New Guinea with over 100 species, and many more to be described. There are two genera represented in New Guinea, "Litoria" and "Nyctimystes". "Litoria" are found throughout both Australia and New Guinea, however, only one of the 24 species of "Nyctimystes"