John Chan / Two male Southern Pacific rattlesnakes (Crotalus oreganus helleri) fighting during mating season. This behaviour is known as a "combat dance", and is used to determine dominance and the right to mate...
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Jeff Foott / Pacific Rattlesnake (Crotalus oreganus) in defensive posture, Carrizo Plain National Monument, California
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John Chan / Two male Southern Pacific rattlesnakes (Crotalus oreganus helleri) fighting during mating season. This behaviour is known as a "combat dance", and is used to determine dominance and the right to mate...
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Gerrit Vyn / Western rattlesnake (Crotalus viridis oreganus) Grant County, Washington, USA, October.
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Gerrit Vyn / Western rattlesnake (Crotalus viridis oreganus) Grant County, Washington, USA, October.
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Gerrit Vyn / Juvenile Western rattlesnake (Crotalus viridis oreganus) Grant County, Washington. October.
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Chris Mattison / Northern Pacific Rattlesnake (Crotalus viridis oreganus) San Jose, California, USA, April.
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James Christensen / Northern Pacific Rattlesnake (Crotalus oreganus oreganus) flicking tongue in defensive posture, Barker Canyon Road, Grand Coulee, Grant County, Washington
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Pete Oxford / Grand Canyon Rattlesnake (Crotalus oreganus abyssus) showing rattle, native to Arizona
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Michael D. Kern / Northern pacific rattlesnake (Crotalus oreganus oreganus) on road, California, USA
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Richard Herrmann / Southern Pacific Rattlesnake (Crotalus viridis helleri) in defensive position, Poway, California
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ZSSD / Southern Pacific Rattlesnake (Crotalus viridis helleri) coiled up showing head with sensory pit organ, North America
