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

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

Doug Gimesy / Forest and Wildlife officers Lachlan Clarke (right) an Emily Cordy watch on as a mother koala (Phascolarctos cinereus) and her joey are released. Editorial use only. Model released

Doug Gimesy / Koala (Phascolarctos cinereus) in a Eucalyptus tree after recent bushfires, just before having a visual inspection for its health. If it is determined that a closer examination is required to determin...

Doug Gimesy / Koala (Phascolarctos cinereus) mother and joey are released by Emily Cordy (left/green clothes) - a Forest and Wildlife officer (and assisted by members from the Australian Defence Force) at Log Cros...

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

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.

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.

Jouan & Rius / Koala (Phascolarctos cinereus) juvenile, sitting on the ground, Otway National Park, Victoria, Australia

Jouan & Rius / Koala (Phascolarctos cinereus) mother with young, Queensland, Australia

Jouan & Rius / Young Koala (Phascolarctos cinereus) climbing, Queensland, Australia

John Cancalosi / Koala bear eating gum leaves, Australia

Tom Vezo / Koala bear (Phascolarctos cinereus) captive Not available for ringtone/wallpaper use.

Suzi Eszterhas / Koala (Phascolarctos cinereus) mother and joey, Kangaroo Island, Australia

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

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

ZSSD / Queensland Koala (Phascolarctos cinereus adustus) eating eucalyptus leaves, native to Australia

ZSSD / Queensland Koala (Phascolarctos cinereus adustus) in eucalyptus tree, native to Queensland

Gerry Ellis / Koala (Phascolarctos cinereus) mother with joey, eastern temperate Australia

Gerry Ellis / Koala (Phascolarctos cinereus) male in tree, Australia

Gerry Ellis / Koala (Phascolarctos cinereus) mother and three month old joey in tree, Australia

Gerry Ellis / Koala (Phascolarctos cinereus) mother and joey, three month old, Australia

Gerry Ellis / Koala (Phascolarctos cinereus) male in tree, Australia

Gerry Ellis / Koala (Phascolarctos cinereus) mother and joey, three month old, Australia

Mitsuaki Iwago / Koala (Phascolarctos cinereus) mother with young clinging to back, Australia

Mitsuaki Iwago / Koala (Phascolarctos cinereus) portrait, Australia

Mitsuaki Iwago / Koala (Phascolarctos cinereus) mother and young in tree, Australia

Mitsuaki Iwago / Koala (Phascolarctos cinereus) male crossing the forest floor, Kangaroo Island, Australia

Mitsuaki Iwago / Koala (Phascolarctos cinereus) forepaw detail, Kangaroo Island, Australia

Shin Yoshino / Koala (Phascolarctos cinereus) group sitting on branch, Lone Pine Koala Sanctuary, Brisbane, Australia

Shin Yoshino / Koala (Phascolarctos cinereus) feeding on Eucalyptus, Australia

Shin Yoshino / Koala (Phascolarctos cinereus) resting in tree, Australia

Shin Yoshino / Koala (Phascolarctos cinereus) mothers and babies in tree, Australia

Shin Yoshino / Koala (Phascolarctos cinereus) portrait in tree, Australia

Mitsuaki Iwago / Koala (Phascolarctos cinereus) in a line on ground, Australia

Mitsuaki Iwago / Koala (Phascolarctos cinereus) group in a line, Australia

Mitsuaki Iwago / Koala (Phascolarctos cinereus) on another's back, Australia

Mitsuaki Iwago / Koala (Phascolarctos cinereus) trio in a line, Australia

Enrique Lopez-Tapia / Koala (Phascolarctos cinereus) sleeping in tree fork. Phillip Island, Victoria, Australia. Captive.

Doug Gimesy / Portrait of a Victorian koala (Phascolarctos cinereus). Koalas from the more southern and colder states of Australia have longer hair than there more northly counterparts. Cape Otway, Victoria, Austra...

Suzi Eszterhas / Koala (Phascolarctos cinereus) joey aged ten months foraging in tree at night. Kangaroo Island, South Australia.

Suzi Eszterhas / Koala (Phascolarctos cinereus) male walking on leaf litter. Kangaroo Island, South Australia.

Suzi Eszterhas / Koala (Phascolarctos cinereus) sitting in tree at night. Kangaroo Island, South Australia.