Common Watersnake
Nerodia sipedon • Order: Squamata, Suborder: Serpentes, Family: Colubridae, Subfamily: Natricinae, Genus: Nerodia, Species: Nerodia 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 Kansas and Nebraska.
Look up Common Watersnake in the Snake Encyclopedia →Family
Order: Squamata, Suborder: Serpentes, Family: Colubridae, Subfamily: Natricinae, Genus: Nerodia, Species: Nerodia sipedon
Conservation
IUCN Red List status is Least Concern, as it has a wide distribution, large population, and high tolerance for habitat alteration, though local populations face threats from road mortality and human persecution.
Physical Description
Robust body with heavily keeled scales. Ground color is typically brown, grey, or reddish, overlaid with dark crossbands on the neck and alternating dark blotches on the back and sides. The head is distinct from the neck, and the belly is heavily patterned with crescents and spots.
Size & Dimensions
This specimen appears to be a sub-adult or small adult, approximately 60 to 75 cm in length. Adults typically range from 66 to 135 cm, with females generally growing larger than males.
Habitat
Found primarily in or near permanent bodies of fresh water such as streams, rivers, lakes, ponds, marshes, and swamps. Prefers areas with abundant basking sites like logs, rocks, or overhanging branches.
Diet & Feeding
Predominantly feeds on fish, amphibians, crayfish, and occasionally small mammals or birds. Uses an active foraging and ambush strategy near or in water, capturing prey and swallowing it live without constriction.
Reproduction
Viviparous, giving birth to live young. Mating occurs in spring, and females typically give birth to litters ranging from 8 to over 50 young in late summer or early autumn.
Look-alikes
Frequently confused with various species of copperheads and cottonmouths due to similar blotched patterns. Unlike the venomous cottonmouth, the common watersnake has vertical dark bars along the labial scales and round pupils.
Conservation Status
IUCN Red List status is Least Concern, as it has a wide distribution, large population, and high tolerance for habitat alteration, though local populations face threats from road mortality and human persecution.
Cultural Significance
Plays a crucial role in aquatic and wetland ecosystems as both a predator of fish and amphibians and as prey for larger birds of prey and mammals. Often misunderstood and mistakenly persecuted due to superficial resemblances to venomous species.
Notable Features
Known for releasing a strong-smelling musk and flattening its head and body when threatened, mimicking the defensive posture of more dangerous snakes despite being entirely harmless.