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
Sinonatrix percarinata Sinonatrix percarinata Sinonatrix percarinata, commonly known as the Eastern water snake, olive keelback, or Chinese keelback water snake, is a species of snake in the subfamily Natricinae. The type locality for "S. percarinata" is Guadun (formerly spelled as Kuatun), Wuyishan City (former Chongan County) in NW Fujian, China. The subspecies "Sinonatrix percarinata suriki" is endemic to Taiwan where it occurs in the whole country. "S. percarinata" is an aggressive snake that bites readily when caught, but it is not venomous. It is a medium-sized snake, typically attaining a total length (including tail) of , but may grow up to .