Ouranosaurus (meaning "brave (monitor) lizard") is an unusual genus of herbivorous iguanodont dinosaur that lived during the early Cretaceous (late Aptian stage) about 110 million years ago in what is now Africa. Ouranosaurus measured about seven to eight metres long (23 to 27 ft). Two rather complete fossils were found in the Echkar (or El Rhaz) Formation, Gadoufaoua deposits, Agadez, Niger, in 1965 and 1972. The animal was named in 1976 by French paleontologist Philippe Taquet; the type species being Ouranosaurus nigeriensis.

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