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 Ontario and Quebec south to North Carolina and west to Colorado and the edge of the Mississippi River.
Look up Common Watersnake in the Snake Encyclopedia →Venomous Status
Non-venomous; lacks fangs or venom delivery apparatus.
Danger Level
Harmless. While they can be defensive if cornered and may bite, they pose no toxicological threat to humans.
Family
Order: Squamata, Suborder: Serpentes, Family: Colubridae, Subfamily: Natricinae, Genus: Nerodia, Species: Nerodia sipedon
Conservation
IUCN Red List: Least Concern. Generally common throughout their range, though local populations can be affected by habitat loss and pollution.
Physical Description
Heavy-bodied snake with highly keeled scales. Coloration is typically brown, tan, or grayish with reddish-brown to black crossbands near the head that break into alternating blotches on the back and sides toward the tail. The belly is often white or yellowish with crescent-shaped dark spots.
Size & Dimensions
Typical adults range from 60 to 100 cm (24-40 inches); maximum recorded length is around 150 cm (59 inches). This specimen looks to be an average-sized adult.
Habitat
Lakes, ponds, marshes, rivers, and streams. Prefers areas with abundant cover and basking sites such as logs or rocks near the water's edge.
Behavior & Temperament
Highly aquatic and active both day and night. They are known for being very defensive when handled, often flattening their heads, biting repeatedly, and releasing a foul-smelling musk.
Diet & Feeding
Generalist carnivore feeding primarily on fish and amphibians (frogs, toads, salamanders). They use an active foraging strategy and swallow prey alive without constriction.
Reproduction
Viviparous (gives birth to live young) rather than laying eggs. Litter sizes range from 8 to 30 young, typically born in late summer or autumn.
Venom Profile
Non-venomous - no medically significant venom.
Look-alikes
Often confused with the venomous Cottonmouth (Agkistrodon piscivorus) due to similar coloration and habitat. They can be distinguished by the Watersnake's round pupils, lack of heat-sensing pits, and different labial scale patterns.
Conservation Status
IUCN Red List: Least Concern. Generally common throughout their range, though local populations can be affected by habitat loss and pollution.
Cultural Significance
Often misunderstood and killed due to confusion with the Cottonmouth. They play a vital ecological role in regulating fish and amphibian populations in wetlands.
Notable Features
Features extremely keeled scales which give the skin a very rough texture. They are capable of staying submerged for extended periods and are remarkably agile swimmers.