Dimetrodon
(dy-MET-ro-don)

Length: 10 feet
Lived during: Permian
Found: North America
Name means: Two measure tooth.
Dimetrodon by far the oldest creature on the pages, was not a dinosaur.  In fact, it wasn't even related to the dinosaurs.  Some scientist say that this ferocious meat eater was more likely an extremely early ancestor to mammals.  Like the much, much later Ouranosaurus, this animal had a sail on its back.  This may have helped to control its body temperature.
Lived at the same time as:  Apatosaurus, (not included in these pages) was similar looking plant eater that lived at the same time and place.

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