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Hoatzin
Order: Cuculiformes
Family: Opisthocomidae
1 species
wooded river banks of northern South America;
60 cm; bill short, stout, laterally compressed; head scantily feathered and crested; neck long, slender; wings and tail large, rounded; legs short; young with clawed manus at hatching;
feed on fruits and leaves; distinctive gut and sternal morphology;
sexes similar; cooperative breeders with 2-4 eggs and biparental care.