AGKISTRODON PISCIVORUS (Cottonmouth). PREDATION. Geococcyx californianus (Greater Roadrunner) is a generalist predator well known for its occasional habit of preying on venomous reptiles. However, to our knowledge Agkistrodon piscivorus (Cottonmouth) has yet to be documented as a prey item for this species (Ernst and Ernst. 2003. Snakes of the United States and Canada. Smithsonian Books, Washington DC. 680 pp.). On 19 September 2014, one of us (TN) observed a G. californianus kill and consume a juvenile A. piscivorus in Hagerman National Wildlife Refuge, Sherman, Texas (Fig. 1) on a dirt road/pathway approximately 130 meters from the nearest body of water. Over the course of 5 to 6 minutes, the G. californianus pecked at and flung the A. piscivorus around until it was unresponsive. At this point, the G. californianus swallowed the snake. TREY NEAL (e-mail: trey@natureswildscapes.com), 3000 Adell Circle, Weatherford, Texas 76088 and DAVID A. STEEN (e-mail: davidasteen@gmail.com), Alabama Natural Heritage Program, 1090 South Donahue Drive, Auburn, Alabama 36832.