Most species of American snakes have a symmetrical arrangement of nine enlarged scales covering the top of their head. Along with the greater percentage of harmless snakes this includes the venomous Pygmy Rattlesnakes; Genus Sistrurus; cottonmouths and copperheads, Genus Agkistrodon; and the coral snakes, Genus Micrurus and Micruroides.
All rattlesnakes of the Genus Crotalus have their heads covered with many small scales.
Copyright © 1991 by American International Rattlesnake Museum
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