Pedro Ramirez, Jr. "Wildlife Mortality Risk in Oil Field Waste Pits." U.S. Fish and Wildlife Service. Environmental Contaminants Specialist.
The risk that oil pits pose to wildlife has been documented by several studies. Hydrofracking involves the storage of "frack water" in open pits.
See: TxSharon (2009). Video. "Cattle Drink Drilling Waste."
See: Robert Myers (2010). Environmental Dangers of Hydro-Fracturing.
See: Laura Legere (2010). Hazards posed by natural gas drilling are not limited to below ground.
See: Pit Pollution.