The indigo snake is a beautiful species of snake that is found in various regions of North and Central America. Some of the synonyms for this snake include blue racer, dark snake, blue bull, black snake, and even horse killer. It is known for its strikingly vivid blue-black color and incredible length, which can range from six feet to eight feet. This snake is a powerful predator that feeds on a variety of prey, including rats, mice, frogs, and even other snakes. These synonyms for the indigo snake show just how unique and important this species is to its habitat and ecosystem.