Kangaroo: &quot;Scientists believe that macropods evolved from a tree-dwelling, possum-like animal that descended to the ground. The musky rat-kangaroo, from Queensland&#x27;s wet tropics, offers a clue to this evolutionary stage. Although it lives on the forest floor it has retained two key characteristics of the tree-climbers: a thumb toe and prehensile tail.&quot; www.bradtguides.com