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Crotalus oreganus facts for kids

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Crotalus oreganus
Crotalus oreganus.jpg
Conservation status
Scientific classification
  • Crotalus oreganus Holbrook, 1840
  • Crotalus oregonus [sic]
    – Holbrook, 1842
  • Crotalus lucifer
    Baird & Girard, 1852
  • C[rotalus]. adamanteus var. lucifer – Jan, 1863
  • C[audisona]. luciferCope, 1867
  • Crotalus hallowelli Cooper In Cronise, 1868
  • Crotalus confluentus var. lucifer
    Cope, 1883
  • [Crotalus oreganus] Var. lucifer
    – Garman, 1884
  • Crotalus confluentus lucifer
    Cope, 1892
  • Crotalus oreganus
    – Van Denburgh, 1898
  • Crotalus oreganus niger
    Kallert, 1927 (Nomen nudum)
  • Crotalus confluentus oreganus
    – , 1929
  • Crotalus viridis oreganus
    – Klauber, 1936
  • Crotalus oreganus oreganus
    – Ashton & de Queiroz, 2001

Crotalus oreganus (commonly known as the western rattlesnake) 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.


  • 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

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