Jumping Vipers grow up to the length of around 90 centimeters (36 inches), while the longest ever found was 120.2 centimeters (47 in). All of them are thick-bodied, with the Mexican Jumping Pit viper being the thickest, and the Picado's Jumping Pit viper being the slimmest. It has a large head, with small eyes, and a rounded snout, it also has a short tail. They are gray-brown, reddish brown or black in color with brown blotches on them.
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