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The sidewinder (Crotalus cerastes), also known as the horned rattlesnake and sidewinder rattlesnake, is a venomous pit viper species belonging to the genus Crotalus (rattlesnakes) and is found in the desert regions of the southwestern United States and northwestern Mexico. Crotalus cerastes is sometimes referred to as the horned rattlesnake because of the raised supraocular scales above its eyes. This adaptation may help shade the eyes or prevent sand drifting over them as the snake lies almost buried in it.