Jouan & Rius / Koala (Phascolarctos cinereus) juvenile in tree, Otway National Park, Victoria, Australia

Dave Watts / Koala with young in tree {Phascolarctos cinereus} Queensland, Australia

David Gallan / Koala (Phascolarctos cinereus) grooming itself in a tree, East Gippsland, Australia, December.

Juergen & Christine Sohns / Koala (Phascolarctos cinereus), Parndana, Kangaroo Island, South Australia, Australia

Dave Watts / Koala (Phascolarctos cinereus), eating Eucalyptus leaves, Victoria, Australia.

Suzi Eszterhas / Koala (Phascolarctos cinereus) mother with joey aged eight months, Queensland, Australia, captive.

Suzi Eszterhas / Koala (Phascolarctos cinereus) mother and joey aged sixth months, Queensland, Australia, captive.

Suzi Eszterhas / Koala (Phascolarctos cinereus) mother mother cuddling her seven-month-old joey, Queensland, Australia

Suzi Eszterhas / Koala (Phascolarctos cinereus) mother cuddling her seven-month-old joey, Queensland, Australia

Roland Seitre / Koala (Phascolarctos cinereus) in tree, Port Lincoln, South Australia, Australia

Inaki Relanzon / Koala (Phascolarctos cinereus) with young in tree, Great Otway National Park, Victoria State, Australia.

Inaki Relanzon / Koala (Phascolarctos cinereus) curled up sleeping in tree, Great Otway National Park, Victoria State, Australia.