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Western rattlesnake

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Western Rattlesnake
Conservation status
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Class: Reptilia
Order: Squamata
Suborder: Serpentes
Family: Viperidae
Subfamily: Crotalinae
Genus: Crotalus
Species: C. Oreganus
Binomial name
Crotalus oreganus
Holbrook, 1840

The Western Rattlesnake (Crotalus Oreganus) is a species of venomous Pit viper. There are currently six subspecies recognized, not including the nominate subspecies.


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.


The Western Rattlesnake eats mainly rodents like the mouse, the rat, and the squirrel, but it also eats rabbits and small birds.

Common Names

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.



  1. 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. Retrieved 26 November 2013.

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