Steven David Miller / Silhouette of an Agile wallaby (Macropus agilis) hopping along the beach at dusk, Cape Hillsborough National Park, Queensland, Australia. September.

Andy Rouse / Agile wallabies (Macropus agilis) sparring and fighting, Bamarru Plains, Northern Territories, Australia

Andy Rouse / Agile wallabies (Macropus agilis) sparring and fighting, Bamarru Plains, Northern Territories, Australia

Andy Rouse / Agile wallaby (Macropus agilis) Bamarru Plains, Northern Territories, Australia

Steven David Miller / Agile wallaby (Macropus agilis) female and joey foraging in campground. Nitmiluk National Park, Northern Territory, Australia.

Steven David Miller / Agile wallaby (Macropus agilis) female and joey standing side by side. Pouch visible on female. Nitmiluk National Park, Northern Territory, Australia.

Steven David Miller / Agile wallaby (Macropus agilis) female cleaning herself with joey squeezed into pouch. Nitmiluk National Park, Northern Territory, Australia.

Steven David Miller / Agile wallaby (Macropus agilis) female with joey in pouch, foraging in campground. Nitmiluk National Park, Northern Territory, Australia.

Steven David Miller / Agile wallaby (Macropus agilis) female with joey in pouch, joey's limbs no longer fit in pouch. Nitmiluk National Park, Northern Territory, Australia.

Steven David Miller / An Agile wallaby (Macropus agilis) chewing on a seed pod washed up on the beach. The wallabies are drawn to the beach at dawn and dusk in search of mangrove seed pods washed ashore and plants growing...

Frederique Olivier / Black-footed rock wallaby (Petrogale lateralis) mother grooming baby on rocks then standing alert; another sheltering behind rocks and leaping up to higher rock. Pilgonaman Gorge, Cape Range National...

Frederique Olivier / Black-footed rock wallaby (Petrogale lateralis) jumping over rocks to shelter in shade, behind mother and joey. Mother standing alert and then grooming baby. Pilgonaman Gorge, Cape Range National Park...