Southern black racer (scientific name: "Coluber constrictor"), the racer is more likely to suffocate or crush its victim into the ground, rather than coiling around it in typical constrictor fashion. Man remains the greatest enemy of black racers. Many are killed on highways and others are intentionally killed out of fear. The white chin causes some people to kill this snake, believing that it is a cottonmouth – a venomous snake more commonly called a water moccasin. The venomous snake has a white lining inside of its mouth. Racers are nonvenomous and do not breed with cottonmouths. Natural enemies include such birds of
Brown water snake (150 m) elevation. The brown water snake is very heavy-bodied, and its neck is distinctly narrower than its head. Dorsally it is brown or rusty brown with a row of about 25 black or dark brown square blotches down its back. Smaller similar blotches alternate on the sides. Ventrally it is yellow heavily marked with black or dark brown. Dorsal scales are in 27-33 rows (more than any other North American water snake), and it has 2-4 anterior temporals (usually 1 in others). Adults measure 30-60 in. (76–152 cm) in total length; record 69 in. (175 cm). "Nerodia taxispilota" is