Diamondbacks are rattlesnakes. Eastern and western diamondbacks are two of the biggest types of snakes that are native to the United States. Students will find out that these pit vipers use their diamond-shaped pattern as camouflage and that their scales are keeled. They will also learn that one of a diamondback's worst enemies is the king snake, because a king snake will eat it and usually not be harmed by a diamondback's venom.