Cranes are a clade of large, long-legged and long-necked birds in the group Gruiformes. There are fifteen species of crane in four genera. Unlike the similar-looking but unrelated herons, cranes fly with necks outstretched, not pulled back. Cranes live on all continents except Antarctica and South America. Most species of cranes are at the least classified as threatened, if not critically endangered, within their range. Source
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