Common Watersnake
Nerodia sipedon • Order: Squamata, Suborder: Serpentes, Family: Colubridae, Subfamily: Natricinae, Genus: Nerodia, Species: Nerodia sipedon
Venomous Status
Non-venomous
Danger Level
Harmless/Low Risk. While non-venomous, they are famously defensive and will bite repeatedly if handled, causing minor bleeding due to an anticoagulant in their saliva.
Geographic Range
Eastern and Central North America, spanning from southern Ontario and Quebec in Canada to North Carolina, and west to Colorado and the edge of the Mississippi River basin.
Conservation Status
IUCN Status: Least Concern. Populations are stable, though they face threats from habitat destruction and being mistaken for venomous Cottonmouths and killed.
Physical Description
Thick-bodied snake with heavily keeled (rough) scales. Coloration is typically dark brown or grayish with lighter dark bands that are wider on the back than the sides. The head is flat and slightly wider than the neck, with round pupils.
Size & Dimensions
The specimen in the photo appears to be an adult around 24-30 inches. Species range is typically 24-42 inches (61-107 cm); maximum recorded nearly 60 inches.
Habitat
Semi-aquatic, living in or near freshwater sources such as lakes, ponds, rivers, marshes, and streams. They are commonly seen basking on rocks, logs, or near human structures like these stairs near water.
Behavior & Temperament
Diurnal and crepuscular, often seen basking during the day. They have a defensive temperament; when threatened, they flatten their bodies to look larger and will readily strike and release a foul-smelling musk.
Diet & Feeding
Primarily piscivorous and carnivorous, feeding on small fish, frogs, toads, salamanders, and occasionally large insects or crayfish. They are active hunters that search underwater or along the shoreline.
Reproduction
Viviparous (gives birth to live young). Breeding occurs in spring, with litters of 15-30 young born in late summer or early autumn.
Venom Profile
Venom Type
Non-venomous - no medically significant venom.
AI-generated — see a qualified source if acting on this. For any snakebite, call emergency services immediately.
Look-alikes
Commonly confused with the venomous Cottonmouth (Agkistrodon piscivorus). To distinguish: Watersnakes have round pupils (Cottonmouths have vertical slits), lack a facial pit, and have labial scales with dark vertical lines.
Conservation Status
IUCN Status: Least Concern. Populations are stable, though they face threats from habitat destruction and being mistaken for venomous Cottonmouths and killed.
Cultural Significance
Crucial for wetland ecosystem health by controlling fish and amphibian populations. Often persecuted by humans who misidentify them as Cottonmouths, leading to unnecessary mortality.
Notable Features
Features heavily keeled scales that give the snake a very rough, dull texture. They are excellent swimmers and can stay submerged for up to 90 minutes while foraging.