NOTE: To get to a printable version of my drawings, just click on the "Free Printable Downloads" button above. The most recent drawings are at the bottom of the list. The Ouranosaurus and Dimetrodon drawings are both new. There are around 300 drawings that you can print.
Ouranosaurus
Ouranosaurus at the Venice Museum
Spinosaurus Fishing
Dimetrodon of the Permian Period
Note: I did a little remodling of this Dimetrodon drawing since I first posted it.
It might just be that also in the hot environment of the Permian Period that having a sail was a good adaptation for cooling off. You might recall that Dimetrodon... a mammal like reptile that lived way before dinosaurs... also had a sail on its back. The sail may have been used to warm up by standing at 90 degrees to the sun. Then to cool down the animal would face directly at or directly away from the sun and a breeze or wind may have helped the sail cool off the blood. Although as a little boy, I had Dimetrodon toy animals that came in my package of toy dinosaurs... Dimetrodon is NOT a dinosaur. Dimetrodon lived in the Permian Period well before the dinosaurs. . . MIlLIONS of years before the dinosaurs. In fact, the name Dimetrodon means "two length teeth"...because it was the first animal with canine teeth. It is thought that Dimetrodon may be the ancestor to all of us now living mammals. Another interesting fact is that one of the primary prey species of Dimetrodon was also sporting a "radiator" sail. It was called Edaphosaurus. (Sorry...too tired to draw one right now. but it was much like Dimetrodon but with a smaller had and blunt plant eater or herbivore teeth.)
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