Indigo snake

   The indigo snake, is a colubrine snake that inhabits the southeastern United States. The snake, Drymarchon corais couperi, is about nine feet (2.70 m) long, black in color, with reddish markings. Like the king snake, it is believed to be an enemy of the rattlesnake.
   The eastern indigo snake is the largest native snake species in the United States.