the brown water snake (Nerodia taxispilota) is a large species of nonvenomous natricine snake endemic to the southeastern United States. This snake is often one of the most abundant species of snakes found in rivers and streams of the southeastern United States, yet many aspects of its natural history is poorly known. Due to abundance and distribution throughout its biological range, this species could be used to investigate anthropogenic impacts on aquatic ecosystems by studying their movements. The brown water snake is very heavy-bodied, and its neck is distinctly narrower than its head. Dorsally, it is brown or rusty brown with a row of about 25 black or dark brown, square blotches down its back. Smaller similar blotches alternate on the sides. Ventrally, it is yellow, heavily marked with black or dark brown. Dorsal scales are in 27-33 rows (more than any other North American water snake), and it has two to four anterior temporals (usually one in others). Adults measure 30–60 in. (76–152 cm) in total length; record 69 in. (175 cm). (Source: Wikipedia.org, CC BY-SA)