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
Water management in the Metropolitan Region of São Paulo expanding water supply exacerbates the exploitation of groundwater resources. There is a high threat of groundwater contamination, especially in the Eastern part of the Alto Tietê. Water demand. Water demand in the Alto Tietê in 2004 was as follows: In the Alto Tietê there is growing conflict between drinking water supply and irrigation. Only one sub-basin of the Alto Tietê can expand its potable water supply from the current supply of 10 m³/s up to 15 m³/s. In other water basins serving the MRSP this is not the case. For example, in the Guarapiranga and Billings basin there is also