Dave Watts / Eastern grey kangaroo (Macropus giganteus) with joey in pouch, Australian Capital Territory, Australia, September

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

Dave Watts / Platypus {Ornithorhynchus anatinus} swimming underwater Tasmania, Australia. Composite.

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

Ingo Arndt / Head portrait of Eastern grey kangaroo {Macropus giganticus} Australia

Ingo Arndt / Yellow-footed rock wallaby (Petrogale xanthopus) Australia, December

Ingo Arndt / Eastern grey kangaroo {Macropus giganteus} juvenile, Australia

Ingo Arndt / Eastern grey kangaroo with joey suckling (Macropus giganteus) Australia

Ingo Arndt / Eastern grey kangaroos sparring {Macropus giganteus} Australia

Ingo Arndt / Eastern grey kangaroo joey looking out of pouch, Wilsons Promontory NP Australia

Ingo Arndt / Eastern grey kangaroo female with joey peering out of pouch {Macropus giganteus}. Wilson Promontory NP Australia

Roland Seitre / Greater bilby (Macrotis lagotis) baby in pouch, vulnerable species, captive, at breeding station, Australia