Northern Watersnake
Nerodia sipedon • Order: Squamata, Suborder: Serpentes, Family: Colubridae, Subfamily: Natricinae, Genus: Nerodia, Species: N. sipedon
Eastern and central North America, ranging from southern Canada down through the eastern and midwestern United States, as far south as the Carolinas, Georgia, and parts of Alabama and Oklahoma.
Look up Northern Watersnake in the Snake Encyclopedia →Family
Order: Squamata, Suborder: Serpentes, Family: Colubridae, Subfamily: Natricinae, Genus: Nerodia, Species: N. sipedon
Conservation
IUCN Red List status is Least Concern, as the species is widespread, generally abundant, and adaptable to various aquatic environments, though localized populations face threats from habitat destruction, pollution, and intentional human persecution due to misidentification.
Physical Description
The visible specimen has a dark brown to blackish dorsal ground color with distinct alternating darker crossbands near the neck and blotches further down the body. The head is relatively distinct from the neck with dark vertical bars along the labial scales (lips) and a whitish-to-reddish mottled pattern on the lower jaw and throat. The scales appear keeled, giving a textured matte appearance, and the eye has a round pupil.
Size & Dimensions
The visible portion suggests a medium-to-large sized individual. Adults typically range from 24 to 42 inches (61 to 107 cm) in total length, with maximum recorded lengths exceeding 55 inches (140 cm).
Habitat
Found almost exclusively near permanent freshwater habitats such as streams, rivers, lakes, ponds, marshes, and swamps. They prefer slow-moving water with an abundance of basking sites like rocks, logs, or overhanging branches, and can be found from sea level up to elevations of around 2,500 feet.
Diet & Feeding
Primarily feeds on aquatic prey including fish, amphibians (frogs, toads, salamanders), and occasionally crayfish, small mammals, or birds. They are active foragers both in and out of the water, relying on acute senses of smell and vibration detection.
Reproduction
Viviparous (giving birth to live young rather than laying eggs). Mating occurs in spring (April to June), and females typically give birth to a litter of 8 to 50+ live young in late summer or early autumn (August to October).
Conservation Status
IUCN Red List status is Least Concern, as the species is widespread, generally abundant, and adaptable to various aquatic environments, though localized populations face threats from habitat destruction, pollution, and intentional human persecution due to misidentification.
Cultural Significance
Plays a vital ecological role in controlling amphibian and fish populations in aquatic ecosystems. Because of their threat posture when cornered, they are frequently misunderstood and wrongfully killed by humans confusing them with other species.
Notable Features
Known for dramatic behaviors when threatened, which include flattening their bodies, striking repeatedly, and musk secretion from cloacal glands. They are also exceptional swimmers and spend a significant portion of their time basking near water.