Gulf crayfish snakeThe Gulf crayfish snake is a subspecies of nonvenomous snake endemic to the southeastern United States.DescriptionIt averages 20 inches when fully grown, with a record of 31.5 inches. Its color is best described as chocolate brown.DietThis subspecies feeds almost entirely on crayfish.TaxonomyClose relatives of the Gulf crayfish snake are the glossy crayfish snake and the Delta crayfish snake.