An adult male koala, phascolarctos cinereus chilling on top of the tree with dark brown scent gland in the centre of the white chest to attract female and mark tree territory, close up shot

koala phascolarctos cinereus bear animal sleep tree species wildlife eucalyptus eucalypt sanctuary natural habitat sedentary conservation reserve lone pine healesville moonlit currumbin marsupial branch zoo park native male taronga sternal scent gland breed season australia white chest australian brown dark centre attract mate mark territory queensland arboreal exocrine pheromone smell sit