(Drymarchon corais), docile, nonvenomous member of the family Colubridae found from the southeastern United States to Brazil. It is the largest snake in the United States—record length is 2.6 metres (8.5 feet)—and one of the largest of all colubrids. In the United States its colour is blue-black; southward it may have brown foreparts, and in the tropics members of the genus often are called brown snakes. It kills small vertebrate animals, including venomous snakes, by crushing with its jaws and the weight of its coils but is not a constrictor.