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Crotalus oreganus helleri
These two male rattlesnakes were battling over a female. It went on for about 40 minutes or so. They were thrashing against each other, rolling and twisting. The loser took off at a rapid pace while the victor gave chase.
Sagebrush, rocky outcrops.
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I can't say I've ever heard of Pacific Diamondback. These look to be Southern Pacific Rattlesnakes, Crotalus oreganus helleri.
Welcome to Project Noah...we are always happy to have fellow snake lovers here!