Any bird species that cannot fly because its smooth, or raftlike, sternum (breastbone) lacks a keel to which flight muscles can be anchored. The group includes some of the largest birds of all time. Two extinct types, the slow-moving, heavy-bodied elephant bird of Madagascar and the moas of New Zealand, grew to 10 ft (3 m) tall. Extant ratites include the cassowary, emu, kiwi, ostrich, and rhea.
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