Moa were giant flightless birds native to New Zealand. They are unique in having no wings, not even small wings, unlike other ratites. Ten species of varying sizes are known, with the largest species, the giant moa (Dinornis robustus and Dinornis novaezelandiae), reaching about 3 m (10 ft) in height and about 250 kg (550 lb) in weight. They were the dominant herbivores in the New Zealand forest ecosystem. Today moa can refer to chickens in many Polynesian cultures.