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Crotalus oreganus, commonly known as the Western rattlesnake or northern Pacific rattlesnake, [4] [5] is a venomous pit viper species found in western North America from the Baja California Peninsula to the southern interior of British Columbia.
These are timber rattlesnakes, a species of rattlesnake native to the East Coast. While timber rattlesnakes are considered endangered in Massachusetts these days, that wasn't always the case.
Members of the genus Crotalus range in size from only 50–70 cm (20–28 in) (C. intermedius, C. pricei), to over 150 cm (59 in) (eastern and western diamondback rattlesnakes). [3] In general, adult males are slightly larger than females.
Western rattlesnake may refer to: Crotalus oreganus, a venomous pitviper species found in North America in the western United States, parts of British Columbia and northwestern Mexico; Crotalus viridis, a.k.a. the prairie rattlesnake, a venomous pitviper species native to the western United States, southern Alberta, Canada, and northern Mexico
[27] [28] However, because of its large venom glands and specialized fangs, the western diamondback rattlesnake can deliver a large amount of venom in a single bite. The average venom yield per bite is usually between 250 and 350 mg, with a maximum of 700–800 mg. [ 5 ] [ 29 ] Severe envenomation is rare but possible, and can be lethal.
A Field Guide to Western Reptiles and Amphibians, Third Edition. The Peterson Field Guide Series ®. Boston and New York: Houghton Mifflin Company. xiii + 533 pp. ISBN 978-0-395-98272-3. (Crotalus pricei, p. 417 + Plate 52 + Map 184). Van Denburgh, J (1895). "Description of a new rattlesnake (Crotalus pricei) from Arizona". Proc. Calif. Acad ...
A Guide to the Rattlesnakes and other Venomous Serpents of the United States. Tricolor Books. Tempe, Arizona. 129 pp. ISBN 978-0-9754641-3-7. (Sistrurus catenatus tergeminus, pp. 74–75.) Say, T. In James, E. 1823. Account of an Expedition from Pittsburgh to the Rocky Mountains, Performed in the Years 1819, 1820.
The eastern massasauga (Sistrurus catenatus) is a rattlesnake species found in central and eastern North America from southern Ontario in Canada and throughout the Midwestern and Eastern United States. Like all rattlesnakes, it is a pit viper and is venomous; it is the only species of venomous snake in Ontario. [4]