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Agkistrodon bilineatus showing the large symmetrical platelike scales on the crown of the head that are characteristic of all species in the genus. The hazy blue eyes are typical of snakes that will soon shed their skin. Members of this genus have a number of features in common. All species have a relatively broad head with short fangs.
This is a list of extant snakes, given by their common names. Note that the snakes are grouped by name, and in some cases the grouping may have no scientific basis. Contents:
Scale patterns help to indicate the species and from the references, it can be verified if the snake species is known to be venomous or not. Species identification using scales requires a fair degree of knowledge about snakes, their taxonomy, snake-scale nomenclature as well as familiarity with and access to scientific literature.
In its Facebook post, the Division of Wildlife mentions a 2004 study that found the snake consumes a greater "diversity of prey," including more than 80 species of fish and 30 species of frog.
The snake has not yet been assessed for the IUCN Red List in terms of conservation, but is listed as endangered in Canada by the Committee on the Status of Endangered Wildlife in Canada. [1] It is listed as a species of special concern in the state of Wisconsin. [2] The blue racer has been on Ontario's Endangered Species List since 1971.
The San Francisco garter snake (Thamnophis sirtalis tetrataenia), however, has been on the endangered list since 1969. Predation by crayfish has also been responsible for the decline of the narrow-headed garter snake (Thamnophis rufipunctatus). [19] Many breeders have bred all species of garter snakes, making it a popular breed.
The plains garter snake is listed as Least Concern (IUCN 3.1) by the IUCN Red List due to the snake's ability to modify its habitat, its wide distribution and its presumed large population. [8] However, the species is considered to be endangered in Ohio and it is on a state list of endangered species.
Handbook of Snakes of the United States and Canada. Ithaca and New York: Comstock Publishing Associates, a division of Cornell University Press. 1,105 pp. (in 2 volumes). (Coluber constrictor, pp. 131–152, Figures 42–47, Map 17). Zim HS, Smith HM (1956). Reptiles and Amphibians: A Guide to Familiar American Species: A Golden Nature Guide.