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of Montana, US and the Ravenscrag Formation of Saskatchewan, Canada, which represent the oldest records of the genus, only about 70,000 years after the Cretaceous-Paleogene extinction event. These early Esox coexisted with their older relative, the extinct Estesesox, and suggest that Esox either evolved very shortly after the extinction event, or already existed by the Late Cretaceous and immigrated to

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