This may aid in recognition between animals. Although It is related to terrestrial kangaroos, they most likely evolved from the same ancestor as the rock wallaby. All kangaroos evolved from possum-like ancestors and the earliest kangaroos bore a resemblance to these possums. As kangaroos adapted to different terrain, they took on different features such as elongated feet which are a feature of terrestrial kangaroos which travel on land. There are 10 species of tree kangaroos, and all are confined to the tropical forests of New Guinea and Queensland Australia.
Tree kangaroos are the largest rain-forest mammals in the Australian realm.
They spend almost all of their time in trees. They have powerful arms, comparatively short hind legs, and long, curved claws. They are solitary and their habitat in high elevations in inaccessible terrain makes their study difficult. Tree kangaroos were first observed by Europeans in 1839. They live in inaccessible areas, and detailed studies in the wild are difficult.