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.

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.

David Gallan / Eastern grey kangaroos (Macropus giganteus) drinking from bird bath as a bushfire burns in the surrounding forest. Sky reddened by ash and smoke. Tathra, New South Wales, Australia. January 2020.

David Gallan / Desperately thirsty eastern grey kangaroos (Macropus giganteus) drink from a bird bath following a bushfire in Tathra, New South Wales, Australia. Water holes had dried up due to drought and food was...

Steven David Miller / Eastern grey kangaroo (Macropus giganteus) female with joey in pouch. Grampians National Park, Victoria, December.

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.