Common Watersnake
Nerodia sipedon • Order: Squamata, Suborder: Serpentes, Family: Colubridae, Subfamily: Natricinae, Genus: Nerodia, Species: N. sipedon
Eastern and central North America, ranging from southern Canada down through the eastern United States to the Gulf Coast and as far west as the Great Plains.
Look up Common Watersnake in the Snake Encyclopedia →Family
Order: Squamata, Suborder: Serpentes, Family: Colubridae, Subfamily: Natricinae, Genus: Nerodia, Species: N. sipedon
Conservation
IUCN Red List status is Least Concern, with stable populations across most of its extensive natural range. Threats include habitat destruction, wetland drainage, and intentional killing due to human misunderstanding.
Physical Description
Robust body with heavily keeled scales, giving a rough texture. Coloration is typically brown, grey, or reddish-brown, featuring darker crossbands on the neck region that transition into alternating dorsal and lateral blotches further down the body. The belly often displays distinct, colorful half-moon or crescent-shaped markings.
Size & Dimensions
Estimated specimen length is approximately 75 cm. Typical adult size ranges from 61 to 135 cm in total length, with females generally growing larger than males.
Habitat
Found almost exclusively near permanent freshwater habitats such as streams, rivers, lakes, ponds, marshes, swamps, and bogs, utilizing shorelines, basking sites on rocks or logs, and overhanging vegetation.
Diet & Feeding
Predominantly feeds on aquatic prey including fish, amphibians (frogs, tadpoles, and salamanders), crayfish, and occasionally small mammals or birds. Primarily an active forager along water edges, hunting both day and night.
Reproduction
Ovoviviparous, giving birth to live young rather than laying eggs. Mating typically occurs in the spring, and litters range from 8 to over 50 offspring, usually born in late summer or early autumn.
Look-alikes
Frequently confused with various species of venomous cottonmouths (Agkistrodon piscivorus) due to similar coloration and defensive displays. Distinguished by a round pupil, lack of facial heat-sensing pits, uniform head shape without prominent cheek bulges, and banded rather than blocky patterns.
Conservation Status
IUCN Red List status is Least Concern, with stable populations across most of its extensive natural range. Threats include habitat destruction, wetland drainage, and intentional killing due to human misunderstanding.
Cultural Significance
Plays a vital role in wetland ecosystems as both predator and prey, helping to regulate amphibian and small fish populations. Frequently targeted and killed by humans who misidentify them.
Notable Features
Known for emitting a strong-smelling musk and biting readily when cornered or handled, flattening the head and body to appear larger and more formidable when threatened.