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Scientific classification
Brown Kiwi, A. australis
Great Spotted Kiwi, A. hastii
Little Spotted Kiwi, A. owenii

This is an article about the flightless birds native to New Zealand called kiwi. For information on the people of that country, who are nicknamed "Kiwis", see New Zealand. For information on the fruit of Chinese origin, see Kiwifruit.

The Kiwi is any of the species of small flightless birds native to New Zealand of the genus Apteryx. At around the size of a domestic chicken, kiwi are by far the smallest living ratites. Though they are thought to be most closely related to either cassowaries or moa, their evolutionary origin is still uncertain.

Prior to the arrival of humans in about 1300 CE, New Zealand had no mammals, and the ecological niches that in other parts of the world were filled by creatures as diverse as horses, wolves and mice were taken up by birds (and, to a lesser extent, reptiles).

Kiwi are shy, nocturnal creatures with a highly developed sense of smell and, most unusually in a bird, nostrils at the end of their long, sharp bill. They feed by thrusting the bill into the ground in search of worms, insects, and other invertebrates; though they also take fruit and, if the opportunity arises, small crayfish, amphibians and eels.

Their adaptation to a terrestrial life is extensive: like all ratities they have no keel on the breastbone to anchor wing muscles, and barely any wings either: the vestiges are so small that they are invisible under the kiwi's bristly, hair-like, two-branched feathers. While birds generally have hollow bones to save weight and make flight practicable, kiwi have marrow, in the style of mammals.

There are three species, one of which has two sub-species: