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|Crested Crane, Balearica regulorum gibbericeps|
Some 5-10 living, see article text.
|Global Distribution of the Cranes and allies.|
The Gruiformes evolved early, long before the passerine songbirds which are the most common birds today. The Gruiform radiation in the Palaeocene and Eocene produced a large variety of medium to large-sized birds. Many of them still prefer the watery habitats which were so common early in the Cainozoic era.