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Gonkoken is a hadrosauroid ornithopod dinosaur from the Late
Cretaceous of what is now Chile. It was fairly small, at approximately 4 m in length, and shows a combination of basal and more derived hadrosauroid traits. Gonkoken's taxonomical and geographic placement prove that non-hadrosaur
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hadrosauroids survived in South
America until the end of the Cretaceous. Based on this, it is hypothesized that the ancestors of Gonkoken migrated south to fill herbivorous niches before being outcompeted by more advanced hadrosaurs in the northern continents.
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Gonkoken: "Wild duck" Late
Cretaceous, South America
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