Australian little penguins, or blue penguins, are one of the smallest penguin species in the world, growing to about a foot. They were once considered a subspecies of the little penguin from New Zealand, but later, mtDNA revealed that the Australian little penguins are a species of their own. Other than their behavioral differences, a critical difference between the two little penguin species is the striking blue plumage of the Australian species.

Little penguins spend most of their day in the ocean. During breeding season, the adults leave their chicks in their nest for the day as they head out into the sea to forage, returning at night to feed their young. One behavioral difference between New Zealand and the Australian penguin is that the Australian blue penguins come ashore in small groups, possibly to protect against predatory marsupials that did not exist in New Zealand.