Common Name: Common water snake Scientific Name: Nerodia sipedon Identification: 16-50 in. Gray or tan above with dark gray or brown crossbands; belly pale with dark, crescent-shaped markings, head unmarked; scales keeled. Habits: Common water snakes like sand bottomed streams and rivers in wooded areas. Distribution: Found in the northern half of the Florida parishes. Comments: Common water snakes are non-venomous.