Not for sure either but I do know some king snakes resemble coral snakes. Yes they do eat rattlesnakes. The only way a rattlesnake can kill a king snake is if it strikes it in it heart. I had a science teacher in high school that had a king snake as a pet and they fed it baby rattlesnakes. He also said they have a distinct smell and you can rub the snake on your pants legs and walk through a den of rattlers, and he says the rattlesnakes will litteraly party the way, like the red sea! I haven't and dont plan to try! Cool find!