Gerry Ellis / Orangutan (Pongo pygmaeus) mother and baby, Borneo

Gerry Ellis / Orangutan (Pongo pygmaeus) young eating bark, Melbourne Zoo, Australia

Steven David Miller / Orchard butterfly {Papilio aegeus} on flowers and leaves, Melbourne zoo, Australia

Steven David Miller / Blue triangle butterfly (Graphium sarpedon) on leaves, Melbourne zoo, Australia, captive

Steven David Miller / Orchard butterfly {Papilio aegeus} on leaves, Melbourne zoo, Australia

Dave Watts / Sumatran Tiger {Panthera tigris} Captive, Melbourne Zoo, Australia, Endangered

Steven David Miller / Australian birdwing butterfly {Ornithoptera priamus} resting. Australia. Captive Melbourne Zoo

Gerry Ellis / Orangutan (Pongo pygmaeus) mother and baby, Melbourne Zoo, Australia

Shin Yoshino / Agile Wallaby (Macropus agilis) pair, Australia

Steven David Miller / Little penguin (Eudyptula minor) on water, captive, Melbourne zoo, Australia, from New Zealand