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The dorsal surface of a pigmy rattlesnake head and a timber rattlesnake (Crotalus horridus) head. Note the nine enlarged plates on the pigmy's head.
These images very modified from E.D. Cope 1898 "The Crocodilians, Lizards, and Snakes of North America". These images were take from the Florida Museum of Natural History Venomous Snakes of Florida Page (with permission--check the link on the pigmy rattlesnake Homepage. | 
