<i>Crotalus oreganus helleri</i>, previously known as <i>Crotalus viridis helleri</i>. Commonly known as the Southern Pacific rattlesnake.
Photo by: Chris Brown
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From: <a rel="nofollow" class="external free" href="https://www.werc.usgs.gov/fieldguide/crvi.htm">http://www.werc.usgs.gov/fieldguide/crvi.htm</a>