Northern water snakes are medium to large snakes, ranging from 61 to 140 cm. Usually only one male copulates with a single female; on occasion there may be two. (Behler and King, 1979; Harding, 1997; Jordan, 1929; Tyning, 1990). Nonindigenous Aquatic Species Database. (Bauman and Metter, 1977), During breeding, a male comes along side a female and rubs his chin along her back, occasionally giving a spasmodic jerk. The Nonindigenous Occurrences section of the NAS species profiles has a new structure. The data represented on this site vary in accuracy, scale, completeness, extent of coverage and origin. Allison Poor (editor), University of Michigan-Ann Arbor. The Lake Erie watersnake subspecies, Nerodia sipedon insularum, was once endangered, but now benefits from the introduction of the round g… Comparison with other species: The Southern Water Snake (Nerodia fasciata) has dorsal crossbands that extend the length of its body, squarish markings on the belly, and a dark stripe from its eye to last supralabial scale. Please report all sightings of this species in Vermont. Underside of the head (chin and throat)C. Elongated scales below the tail (subcaudal scales) are typically dividedD. Amphibians and Reptiles of the Great Lakes Region. Type-locality, “North America”. Because of their preference for aquatic habitats they are commonly mistaken for venomous water moccasins, Agkistrodon piscivorous. The Northern Watersnake has been designated a Species of Greatest Conservation Need (medium priority) in Vermont’s Wildlife Action Plan. They also use their sense of sight and detection of vibrations to locate prey. The ADW Team gratefully acknowledges their support. This species has a state natural heritage rank of S3 (uncommon, localized). Northern water snakes are the most common snakes near water sources throughout northeastern North America. It is most often seen basking on rocks, stumps, or brush. It is quite common to find northern water snakes sunning themselves during the warm part of days. Northern water snakes hunt both during the day and at night. The belly is yellowish marked with two rows of half moons. Larger females tend to have larger litters. Additional support has come from the Marisla Foundation, UM College of Literature, Science, and the Arts, Museum of Zoology, and Information and Technology Services. Referring to something living or located adjacent to a waterbody (usually, but not always, a river or stream). 1979. Help us improve the site by taking our survey. Young snakes are born alive (not laid as eggs) from July to September. (Tyning, 1990). They have been known to herd schools of fish or tadpoles to the edge of bodies of water where they can prey upon many at one time. These crossbands and blotches are separated by at least 2.5 dorsal scale rows of the lighter colored dorsal scales. They darken with age to almost solid black with dark brown blotches. (Harding, 1997), Northern water snakes utilize many different aquatic habitats, such as: rivers, streams, sloughs, lakes, ponds, bogs, marshes, and impoundments. Holotype apparently lost as it is no longer available in the Uppsala University Zoo-logical Museum (Wallin 1991). Harmless Water Snakes are frequently confused with the venomous Cottonmouth (Agkistrodon piscivorus). © 2020 Regents of the University of Michigan. movements of a hard surface that are produced by animals as signals to others. Savannas are grasslands with scattered individual trees that do not form a closed canopy. This may actually help the sport fishing industry. (Harding, 1997), These are dark-colored snakes, brownish, tan or grayish in appearance. Take photos if possible. having a body temperature that fluctuates with that of the immediate environment; having no mechanism or a poorly developed mechanism for regulating internal body temperature. (Harding, 1997). Northern water snakes are found in southern Ontario and the northeastern United States from Nebraska and Kansas in the west to the Atlantic coast and as far south as North Carolina and southern Missouri. chemicals released into air or water that are detected by and responded to by other animals of the same species, having more than one female as a mate at one time. At night, it concentrates on minnows and other small fish sleeping in shallow water. A terrestrial biome. Range: In Florida, the Midland Water Snake is found in the panhandle. It is live-bearing. Extensive savannas are found in parts of subtropical and tropical Africa and South America, and in Australia. Nerodia sipedon. Classification, To cite this page: Range/Habitat. This information is preliminary or provisional and is subject to revision. They are not constrictors, they simply swallow their prey alive. Snakes of this species are often killed by people who are afraid of them, and confuse them with venomous species, such as rattlesnakes. The section is now dynamically updated from the NAS database to ensure that it contains the most current and accurate information. A. (Harding, 1997; Tyning, 1990). Adults are light brownish with less than 30 darker brown crossbands near the neck, which break up into alternating blotches further down the body. The Audubon Society Field Guide to North American Reptiles and Amphibians, Amphibians and Reptiles of the Great Lakes Region, Stokes Nature Guides: A guide to Amphibians and Reptiles. Contact us if you are using data from this site for a publication to make sure the data are being used appropriately and for potential co-authorship if warranted. A terrestrial biome found in temperate latitudes (>23.5° N or S latitude). Accessed October 20, 2020 at https://animaldiversity.org/accounts/Nerodia_sipedon/. Manual of the Vertebrate Animals. For the most part they are solitary animals, especially in the warmer months. Boston, MA: Little, Brown and Company.
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