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Geographic range 
This species ranges through the temperate region of North America east of the Mississippi River from western New York state to Wisconsin and south to Alabama and northern Florida. It is also found in the southwestern parts of Ontario.
The queen snake is similar in appearance to a garter snake, genus Thamnophis, so is often confused with that group. The queen snake is olive to gray or dark brown in overall coloration, with peach or yellow stripes that run down its length at the first scale row. There are also four prominent ventral stripes of a darker colour, and as no other similar species has stripes running down the length of its belly, this is an important feature in identifying this snake. In the young and juvenile snakes there are three extra stripes: one stripe that runs along the vertebral dorsal scales, and two stripes (one on each side) that run down the length of the body at scale rows five and six. These extra stripes tend to fade as the snake matures, but when young the snake will have a total of seven stripes, three on the back and four on the belly, which gives cause for its taxonomical reference name, Regina (queen) septemvittata (seven-striped). The belly of the snake is a cream to yellow colour.
The head of the queen snake is narrow and has nine large plate-like scales on the top and the chin has several rows of thicker scales. This is a protective adaptation, for the snake's feeding habit of chasing its prey under rocks. The pupils of the eye are round, a feature shared with most other colubrids. There are 19 scale rows at midbody and these scales are keeled, and the anal plate is divided. The sexes are often difficult to distinguish based on external characteristics. Male queen snakes have relatively longer tails than females. Males have from 65 to 89 subcaudal scutes (average 76), with the tail from 23% to 34% of the snake's total length. Females have 54 to 87 subcaudals (average 69), with tails equal to 19% to 27% of total length.
Queen snakes are not large, and they seldom grow more than 24 inches (60 cm.) in length. The females are generally slightly larger than the male and female queen snakes will be fully mature at three years of age, the males at two. Breeding takes place in the spring and autumn months. If mating was in the autumn, the female can delay giving birth till spring, storing the energy she will need through the months that she will be hibernating. This snake is ovoviviparous, the female giving birth to live young after carrying the eggs within her body. This differs from oviparous and viviparous snakes. Litter size can vary from 5 to 20, and the time for an individual birth is from 1.5 to 2.5 minutes. Time between individual births is 4 minutes to 1 hour, with the average time being 11 minutes.
The newly born snakes will be approximately 6 in (15 cm) long and weigh 0.1 oz (3 g). Newborn snakes begin to grow very rapidly and may shed their skin twice in their first week while living on the nutrient rich yolk stores they preserve through this time in their lives. The baby snakes are able to swim and move about and they must fend for themselves independently directly after birth. Juvenile queen snakes range from 17.5 to 23 cm (6.9 to 9 in) in length.
The habitat requirements for the queen snake are very specific, and this snake is never found in areas that lack clean running streams and watersheds with stony and rocky bottoms. The water temperature must be a minimum of 50°F (10°C) during the snake's active months. This is in a large part due to the snake's dietary requirements. They subsist almost entirely on fresh water crayfish. It preys almost exclusively on newly-molted crayfish, which are not able to defend themselves effectively with their pincers. One study indicates that this type of snake may consume over 90% of its diet strictly on crayfish. Other sources of food include frogs, tadpoles, newts, minnows, snails, and fairy shrimp. The queen snake does not find its food by sight or heat detection, but by smell, using its tongue to carry the scent of its prey to receptors within its mouth. In this way it is able to home in on its prey, even under water.
The queen snake hibernates throughout the winter months, and groups of them can be found in "hibernacula", near water. These hibernation dens can be inside old bridge abutments, cracked concrete retaining walls and dams, and in niches of bedrock. During this time, the snakes are lethargic, and their main prey, crayfish, may become the predator, particularly of the young snakes.
It is a diurnal species, but it can be found moving about and hunting at night as well. They are often found by turning over rocks within or near the brooks and streams they inhabit. They will also come out of the water to bask in the sun, often perching on branches or roots above or near the waters edge. Queen snakes are very alert to any potential danger and will drop into the water when disturbed. They are rather docile snakes, not too likely to bite and can be easily handled. However, in doing so, one risks being polluted by malodorous feces and anal musk, similar to the behaviour of the garter snake in this defense.
Predators of queen snakes are raccoons, otters, mink, hawks and herons. Large frogs and fish will also eat the young snakes. The main threat to the queen snake is habitat loss as waterways are drained, disturbed or polluted. Crayfish, their main food, are sensitive to acidification and accumulation of heavy metals. Thus, as waterways have become polluted and crayfish have died out, the queen snake population has declined throughout its former range. In many areas the queen snake has disappeared or has become in danger of doing so.
Popular culture 
- Whit Gibbons and Michael Dorcas, 2005. Snakes of the Southeast. Athens, Georgia: University of Georgia Press. ISBN 0-8203-2652-6.
- Michigan Snakes: A Field Guide and Pocket Reference (1989; rev. 1998) by J.A. Holman, J.H. Harding, M.M. Hensley, and G.R. Dudderar, Michigan State University Cooperative Extension Service, East Lansing, E-2000.
- Smith, Kim. 1999. COSEWIC Status Report on the QUEEN SNAKE, Regina septemvittata. Committee on the Status of Endangered Wildlife in Canada. 27 pp.
Further reading 
- Say, T. 1825. Descriptions of three new species of COLUBER, inhabiting the United States. Journ. Acad. Nat. Sci. Philadelphia 4 (2): 237-241. (Coluber septemvittatus, pp. 240–241.)
- Michigan Herpetologist's Queen Snake Article
- Queen Snake
- The Queen Snake, Florida Museum of Natural History
- Canadian Government's Information on the Queen Snake
- Queen Snake, Natural Resources Canada
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