Common Watersnake
Nerodia sipedon • Order: Squamata, Suborder: Serpentes, Family: Colubridae, Subfamily: Natricinae, Genus: Nerodia, Species: Nerodia sipedon
Found primarily in eastern and central North America, ranging from southern Canada down through the eastern United States to the Gulf Coast and west to the Great Plains.
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, with stable populations across its native range, though local populations face threats from habitat loss and intentional killing.
Physical Description
Features a stout body with dark crossbands on the neck transitioning to alternating blotches on the back and sides. The coloration can range from brown, gray, to reddish-brown, often darkening significantly when wet. Scales are heavily keeled, and the head is somewhat distinct from the neck.
Size & Dimensions
Adult length typically ranges from 75 to 135 cm (30 to 53 inches), with females generally growing larger than males.
Habitat
Inhabits freshwater environments such as streams, rivers, lakes, ponds, marshes, and swamps. It prefers slow-moving water bodies with abundant basking sites like rocks, logs, or emergent vegetation.
Diet & Feeding
Feeds primarily on fish, amphibians, and occasionally crayfish or small mammals. It is an active forager, frequently hunting in shallow water and seizing prey directly.
Reproduction
Ovoviviparous, giving birth to live young. Mating typically occurs in the spring, and females produce litters averaging around 20 to 30 young in late summer.
Look-alikes
Frequently confused with various species of copperheads or cottonmouths due to pattern similarities. Distinguished by a round pupil, lack of facial heat-sensing pits, and a patterned belly.
Conservation Status
IUCN Red List status is Least Concern, with stable populations across its native range, though local populations face threats from habitat loss and intentional killing.
Cultural Significance
Plays an important ecological role in aquatic food webs by regulating amphibian and fish populations. Often subjected to unwarranted persecution due to misidentification with other aquatic snakes.
Notable Features
Demonstrates strong semi-aquatic adaptations with nostrils and eyes positioned high on the head to facilitate breathing and observation while submerged.