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

Juergen Freund / Margit Cianelli wildlife carer with young Lumholtz kangaroos (Dendrolagus lumholtzi), one with a radio collar. The tree kangaroo has a radio collar to allow her to explore her forest surroundings read...

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

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

Konrad Wothe / Lumholtz's Tree-kangaroo (Dendrolagus lumholtzi) sitting on branch in rainforest, Atherton Tablelands, Queensland, Australia, October

Dave Watts / Eastern grey kangaroo (Macropus giganteus) bounding, Australian Capital Territory, Australia, September

Dave Watts / Eastern grey kangaroo (Macropus giganteus) family group, male, female and large joey, Tasmania, Australia, February

Dave Watts / Eastern grey kangaroo (Macropus giganteus) two males boxing, Australian Capital Territory, Australia, December