Gruiformes (cranes, rails, bustards; class Aves) A diverse order of small to large aquatic and terrestrial birds that comprises 12 families: Aramidae, Cariamidae, Eurypygidae, Gruidae, Heliornithidae, Mesitornithidae, Otididae, Pedionomidae, Psophiidae, Rallidae, Rhynochetidae, and Turnicidae. They are found world-wide.
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