NOT venomous but may bite if harassed. Typically found in and around bodies of water. Head is only slightly wider than neck, keeled scales, round pupils. Stocky body with a pattern of large dark blotches down the spine, smaller blotches down the sides. Bold pattern when young, darkens with age. Typically 30 inches up to 4 feet (76 to 120cm) in length. (J. R. Dixon and J. E. Werler, Texas Snakes: A Field Guide, University of Texas Press, 2000.)