Common Watersnake
Nerodia sipedon • Order: Squamata, Suborder: Serpentes, Family: Colubridae, Subfamily: Natricinae, Genus: Nerodia, Species: Nerodia sipedon
North America: Eastern and Central United States and Southeastern Canada (Ontario and Quebec). The specimen in the image is in Ontario, Canada, within its natural range.
Look up Common Watersnake in the Snake Encyclopedia →Venomous Status
Non-venomous (Aglyphous - lacks specialized venom-delivering fangs)
Danger Level
Harmless / Low Risk. Though completely non-venomous, they are famously quick to strike and bite if handled or cornered and can produce an unpleasant musk.
Family
Order: Squamata, Suborder: Serpentes, Family: Colubridae, Subfamily: Natricinae, Genus: Nerodia, Species: Nerodia sipedon
Conservation
IUCN Status: Least Concern. Populations are stable, though they face threats from habitat destruction and persecution by humans who mistake them for venomous species.
Physical Description
Heavy-bodied with strongly keeled scales. Coloration is typically brown, gray, or reddish-brown with dark crossbands near the head that break into alternating dorsal and lateral blotches further down the body. The head is distinct from the neck with round pupils.
Size & Dimensions
The specimen appears to be an adult, approximately 60-90 cm in length. The species typically ranges from 60 to 100 cm, with large females occasionally reaching 130 cm.
Habitat
Primarily semi-aquatic, found in lakes, rivers, ponds, and marshes. They are often seen basking on rocks or logs near water but may wander into urban areas, especially near drainage systems.
Behavior & Temperament
Diurnal and crepuscular; highly defensive if threatened. They will flatten their bodies to appear larger, strike repeatedly, and release a foul-smelling musk and feces if captured.
Diet & Feeding
Generalist carnivore focusing on fish and amphibians (frogs, toads, salamanders). They use active foraging and lunging maneuvers to swallow prey alive without constriction.
Reproduction
Viviparous (gives birth to live young). Large litters of 15-30 young are typical, usually born between August and October.
Venom Profile
Non-venomous - no medically significant venom.
Look-alikes
Commonly confused with the Northern Cottonmouth (Agkistrodon piscivorus). Distinguishable by round pupils (Cottonmouths have vertical slits), lack of facial pits, and slenderer head profile. In Ontario, they are sometimes mistaken for the rare, venomous Massasauga Rattlesnake, which has a rattle and different pattern.
Conservation Status
IUCN Status: Least Concern. Populations are stable, though they face threats from habitat destruction and persecution by humans who mistake them for venomous species.
Cultural Significance
Ecologically vital for controlling fish and amphibian populations. Frequently misunderstood and killed due to their resemblance to venomous species and their irritable disposition.
Notable Features
Excellent swimmers that can remain submerged for extended periods. Their scales are exceptionally rough (keeled), giving the snake a matte, non-reflective appearance even when wet.