Common Watersnake
Nerodia sipedon • Order: Squamata, Suborder: Serpentes, Family: Colubridae, Subfamily: Natricinae, Genus: Nerodia, Species: Nerodia sipedon
Venomous Status
Non-venomous
Danger Level
Harmless; although non-venomous, they are famously feisty and will bite repeatedly and musk if handled, which may cause minor bleeding due to anticoagulants in their saliva.
Geographic Range
Found across Eastern and Central North America, from Southern Canada south to North Carolina and west to Colorado and the Mississippi River.
Conservation Status
Least Concern (IUCN); widespread and adaptable to human-altered environments, though often killed by people who mistake them for venomous cottonmouths.
Physical Description
Heavy-bodied snake with keeled scales. Coloration varies from brown to reddish-brown or grey with dark crossbands near the head that break into alternating blotches further down the body. This specimen shows a vibrant reddish-brown phase. Eyes have round pupils.
Size & Dimensions
The specimen appears to be an adult around 24 to 36 inches (60-90 cm). The species typically ranges from 22 to 42 inches, with a maximum record of about 55 inches.
Habitat
Highly aquatic; common near lakes, ponds, marshes, rivers, and canals. Often found basking on rocks, logs, or in vegetation overhanging water.
Behavior & Temperament
Diurnal and crepuscular; active during the day basking or foraging. They are flighty and will dive into water when startled. If cornered, they flatten their heads and strike vigorously.
Diet & Feeding
Primarily piscivorous and carnivorous; feeds on fish, frogs, salamanders, and occasionally small mammals or birds. They use active foraging and swallow prey alive.
Reproduction
Viviparous (gives birth to live young). Mating occurs in spring, and females give birth to 15-30 young in late summer or early autumn.
Venom & Safety
Venom Type
Non-venomous - no medically significant venom.
First Aid Advice
No medical intervention is required for a bite other than cleaning the wound with soap and water to prevent secondary infection. Despite slight anticoagulant properties in saliva, bleeding should stop quickly.
Look-alikes
Commonly confused with the venomous Cottonmouth (Agkistrodon piscivorus). Distinct from Cottonmouths by their round pupils, lack of heat-sensing pits, and labial scales with vertical black lines.
Conservation Status
Least Concern (IUCN); widespread and adaptable to human-altered environments, though often killed by people who mistake them for venomous cottonmouths.
Cultural Significance
Ecologically important as a mid-level predator that controls fish and amphibian populations. Often unfairly persecuted due to its resemblance to the Cottonmouth.
Notable Features
Features heavily keeled scales and a specialized saliva containing mild anticoagulants to help process slippery fish prey.