When I think of kangaroos, the image of large macropods bounding across the Australian outback most readily comes to mind. Oddly enough, though, some kangaroos became adapted to life in the trees and belong to the genus Dendrolagus. Previously I thought there was only one species of tree kangaroo, but apparently there are many, although some of the distinctions between species and subspecies are still contested.
I'd like to see one in the wild. All my encounters so far have been with road kill on the Atherton Tablelands (SW of Cairns in Far North Queensland.) As you can imagine, that's not the best way to see them.
Tree kangaroos are hard to see even where common. They lived in several of my forest study sites in Queensland, and I only saw them a few times. However many of the thin barked rain forest trees showed evidence of their presence, the distinctive scars left by their hind claws.