How are koalas adapted for life in the tree?

Koalas have very strong claws suitable for gripping trees and climbing. The shape and design of their fingers enables them to act like opposable thumbs. Between their first and second "fingers" is a large gap, which enables them to also grip tree branches comfortably, whilst their hind legs have one toe set at a wide angle. They also have toes with thick pads which enable them to sit comfortably in a tree all day.