In this photo taken on Dec. 12, 2010, Dimetrodon fossil is shown during a Houston Museum of Natural Science paleontologist team field expedition to excavate a nearly complete Dimetrodon fossil at the ... more 
In this photo taken on Dec. 12, 2010, Dimetrodon fossil is shown during a Houston Museum of Natural Science paleontologist team field expedition to excavate a nearly complete Dimetrodon fossil at the Craddock Ranch in Seymour, Texas. less 
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Associated Press | Photo By Houston Chronicle, James Nielsen
Fri, Dec 17, 2010 11:02 AM EST