What are a rattlesnake's predator?

Young Rattlesnakes (less than 2 years old) are heavily preyed upon by numerous species like Ravens, Crows, Raccoons, Coyotes, Weasels etc. Even Adult Rattlesnakes are known to cannibalize youngsters. Adolescent Rattlesnakes (above 2 years) are preyed upon by larger predators like Eagles, Hawks, Badgers, Kingsnakes etc. Adult Rattle snakes have only one known predator the "Kingsnake" which is a constrictor. It is immune to the venom of Rattlesnakes and other Vipers and consumes them as a part of its natural diet.