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SquidMillions of years ago, prehistoric sea creatures swam Earth's waters. This image gallery offers a glimpse at what these "sea monsters" may have looked like. Pictured here: A prehistoric squid. Remains of these animals have been found near Australia, Germany, and in the Western Interior Seaway, a vast sea that once bisected North America.    
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Image Gallery: Sea Monsters

See prehistoric sea creatures pictures in this gallery from National Geographic.

Published October 20, 2009