Long-necked marine reptiles called plesiosaurs hunted the waters of the Western Interior Seaway that once covered much of central North America.
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Prehistoric Denver: Plesiosaur Sea
Long-necked marine reptiles called plesiosaurs hunted the waters of the Western Interior Seaway that once covered much of central North America.
Added: Feb 19, 2010
Views: 34611 Views
Runtime: 01:38
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