The western long-beaked echidna — the largest of the four living echidnas — uses its elongated snout and spiny tongue to catch slippery earthworms. It is Critically Endangered, and found only in western New Guinea.

The Bawean hog deer is the rarest deer in the world. It's only found on the small Indonesian island of Bawean and is considered 'critically endangered' — with an estimated population of fewer than 300 individuals.

The mistletoebird of Australia and Indonesia specializes in feeding on mistletoe berries — digesting the flesh and depositing the sticky seeds onto branches in neat lines, where they quickly germinate and grow. The bird is nomadic, in near-constant search of mistletoe berries.