Birds are adapted for flight with features like pneumatic skeletons and specialized wings; however, not all birds are capable of flight. Flightless birds, like ostriches, have adapted to their environments by increasing in size, a pattern scientists have observed in examinations of recently extinct birds, which were even larger than their present-day counterparts: the largest moas of New Zealand and the elephant birds of Madagascar may have reached over 3 meters (10 feet) in height.
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