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        Fossil skeleton of  Dimetrodon grandis,  National Museum of Natural History,  Washington, DC.
        Digital photo by  User:Postdlf, taken 2/20/05.
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            Postdlf, the copyright holder of this work, hereby publishes it under the following license:
           
            
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             Permission is granted to copy, distribute and/or modify this document under the terms of the  GNU Free Documentation License, Version 1.2 or any later version published by the  Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled  GNU Free Documentation License.  http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue 
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