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Hesperornis was the Late Cretaceous (85‒78 Ma) genus of flightless birds. It possessed a prolonged skull and markedly toothed beak. Its legs were adapted for swimming and diving, and its wings were stunted. Its feet did not possess webs but they had rather developed flat lobes. Hesperornis preyed on fish and marine mollusks. Hesperornis remains have been documented in North America and the Ural Mountains region. ## Keywords Mesozoic, Cretaceous, birds
