Jiri Lochman / Burrowing Bettong / Boodie (Bettongia lesueur) looking around at night. Dorre Island, Shark Bay, Western Australia.

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

Dave Watts / Female Western grey kangaroo (Macropus fuliginosus) rolling with a large joey in her pouch, Kangaroo Island, South Australia.

Dave Watts / Female Tamar wallaby (Macropus eugenii) grazing with a joey in her pouch, Kangaroo Island, South Australia.

Dave Watts / Two female Australian sea lions (Neophoca cinerea) playing and interacting on a beach, with others nearby, Seal Bay Conservation Area, Kangaroo Island, South Australia.

Dave Watts / Female Australian sea lion (Neophoca cinerea) scratching and rolling on a beach, Seal Bay Conservation Area, Kangaroo Island, South Australia.

Martin Willis / Allied Rock Wallaby (Petrogale assimilis) mother with joey, Magnetic Island, Queensland, Australia

D. Parer & E. Parer-Cook / Eastern Grey Kangaroo (Macropus giganteus) portrait, Maria Island National Park, Tasmania, Australia

D. Parer & E. Parer-Cook / Eastern Grey Kangaroo (Macropus giganteus) female cleaning joey in pouch, Maria Island National Park, Australia

D. Parer & E. Parer-Cook / Eastern Grey Kangaroo (Macropus giganteus) males fighting for dominance and access to females, Maria Island National Park, Australia

Inaki Relanzon / Remarkable Rocks at night, Flinders Chase National Park, Kangaroo Island, South Australia State, Australia, September 2011.

Inaki Relanzon / Australian Sea Lion (Neophoca cinerea) sitting on beach with one flipper up, Seal Bay Conservation Park, Kangaroo Island, South Australia State, Australia.