Queen snake
The queen snake (Regina septemvittata) is a species of nonvenomous semiaquatic snake, a member of the subfamily Natricinae of the family Colubridae. The species is endemic to North America.

Common names
R. septemvittata is known by many common names, including the following: banded water snake, brown queen snake, diamond-back water snake, leather snake, moon snake, North American seven-banded snake, olive water snake, pale snake, queen water snake, seven-striped water snake, striped water snake, three-striped water snake, willow snake, and yellow-bellied snake.

Geographic range
R. septemvittata 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.

New Jersey was at the edge of its range and it is now believed to be extirpated from the state. Decreases in Queen snake populations can be most attributed to a loss of food sources through stream channelization, bank erosion, and water pollution.

Appearance
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 color, 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 color.

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 pupil of the eye is round, a feature shared with most other colubrids. There are 19 rows of keeled dorsal scales at midbody, 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 to more than  in total length (including tail). The females are generally slightly larger than the males.

Reproduction
Female queen snakes will be fully sexually mature at three years of age, males at two years. Breeding takes place in the spring and autumn months. If mating was in the autumn, the female can delay giving birth until spring, storing the energy she will need through the months that she will be in a period of brumation. 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  long and weigh . 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  in length.

Habitat
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  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 crayfish make up over 90% of the snake's diet.
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.

Habits
The queen snake is in a period of brumation 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. Their main defenses are thrashing, spinning, and secreting malodorous feces and anal musk, similar to the behaviour of the garter snake in this defense. Queen snakes have been shown to use the sun for celestial orientation in their habitat.

Predators of queen snakes are raccoons, otters, mink, hawks and herons. Large frogs and fish will also eat the young snakes. When approached by predators, queen snakes will flee a distance directly related to their internal temperature. 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.

Diet
Queen snakes are described as dietary specialists, feeding primarily on crayfish. They have been documented favoring crayfish that are freshly molted. R. septemvittata are especially sensitive to a chemical compound called ecdysone that is produced by crayfish during their molting cycle which help them find that prey easier. One study done offered crayfish during their molting cycle and crayfish not on their molting cycle to queen snakes to see which they preferred.  The results showed that the queen snakes would not eat the prey if it was not releasing ecdysone. If none of these prey can be found, queen snakes will resort to eating small fish.

References

Sources 
Gibbons, Whit; Dorcas, Michael (2005). Snakes of the Southeast. Athens, Georgia: University of Georgia Press. .
Holman, J. Alan; Harding, James H.; Hensley, Marvin M.; Dudderar, Glenn R. (1989, revised 1998). Michigan Snakes: A Field Guide and Pocket Reference. East Lansing: Michigan State University Cooperative Extension Service. E-2000. 76 pp. , .
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
Conant, Roger (1975). A Field Guide to Reptiles and Amphibians of Eastern and Central North America, Second Edition. Boston: Houghton Mifflin Company. xviii + 429 pp. + Plates 1-48.  (hardcover),  (paperback). (Natrix septemvittata, pp. 149–150 + Plate 21 + Map 109).
Conant, Roger; Bridges, William (1939). What Snake is That? : A Field Guide to the Snakes of the United States East of the Rocky Mountains. (With 108 drawings by Edmond Malnate). New York and London: D. Appleton-Century Company. Frontispiece map + 163 pp. + Plates A-C, 1-32. (Natrix septemvittata, pp. 97–98 + Plate 17, figure 50).
Powell R, Conant R, Collins JT (2016). Peterson Field Guide to Reptiles and Amphibians of Eastern and Central North America, Fourth Edition. Boston and New York: Houghton Mifflin Harcourt. xiv + 494 pp., 47 plates, 207 Figures. . (Regina septemvittata, pp. 422–423 + Plate 41).
Say, Thomas (1825). "Descriptions of three new species of Coluber, inhabiting the United States". Journal of the Academy of Natural Sciences of Philadelphia 4 (2): 237-241. (Coluber septemvittatus, new species, pp. 240–241).
Schmidt, Karl P.; Davis, D. Dwight (1941). Field Book of Snakes of the United States and Canada. New York: G.P. Putnam's Sons. 365 pp. (Natrix septemvittata, pp. 211–213, Figures 67-68 + Plate 22).
Smith, Hobart M.; Brodie, Edmund D. Jr. (1982). Reptiles of North America: A Guide to Field Identificatiion. New York: Golden Press. 240 pp. . (Regina septemvittata, pp. 158–159).

External links 

 Michigan Society of Herpetologists' 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

Regina (snake)
Snakes of North America
Reptiles of the United States
Fauna of the Eastern United States
Reptiles of Canada
Reptiles of Ontario
Reptiles described in 1825
Taxa named by Thomas Say
Extant Pleistocene first appearances