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
Brazos water snake Brazos water snake The Brazos water snake ("Nerodia harteri" ), also called commonly Harter's water snake, is a species of mostly aquatic, nonvenomous snake in the family Colubridae. The species is endemic to Texas in the United States. "N. harteri" is found only in central Texas in the Brazos River system. The preferred habitat of "N. harteri" is rocky areas along the Brazos River. Due to its limited range, "N. harteri" is considered to be a threatened species in the State of Texas. The specific name or epithet, "harteri", is in honor of American amateur herpetologist Philip Harter, who collected