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| Crotalus oreganus|
The Western Rattlesnake is a large species of the Crotalus.They can reach to the size of 100 centimeters (39 in) in length, but the longest ever found was the size of 162.6 centimeters (64 in). They are usually dark brown, dark gray, or olive brown in color, covered with dark blotches and uneven white edges.
Some of the Western Rattlesnakes names included the "Northern Pacific Rattlesnake", the "Black Diamond Rattlesnake", the "Arizona Diamond Rattlesnake", the "California Rattlesnake", the "Hallowell's Rattlesnake",and the "Oregon Rattlesnake".
Where they live
The Western Rattlesnake is found in North America, from southwestern Canada, western U.S.A, and northern Mexico.In Canada it is found in southern British Columbia. In the U.S.A it is found in Washington, Oregon, western and southern Idaho, California, Nevada, Utah, and Arizona. In northern Mexico it is found in western Baja California.
- Grand Canyon Rattlesnake, C. o. abyssus
- Coronado Island Rattlesnake, C. o. caliginis
- Arizona Black Rattlesnake, C. o. cerberus
- Midget Faded Rattlesnake, C. o. concolor
- Southern Pacific Rattlesnake, C. o. helleri
- Great Basin Rattlesnake, C. o. lutosus
- Hammerson, G.A., Frost, D.R. & Hollingsworth, B. (2007). "Crotalus Oreganus". IUCN Red List of Threatened Species. Version 2013.1. International Union for Conservation of Nature. http://www.iucnredlist.org/apps/redlist/details/64326. Retrieved 26 November 2013.
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