Western rattlesnake

Crotalus oreganus
Crotalus oreganus
Crotalus oreganus is a venomous pitviper species found in North America in the western United States, parts of British Columbia and northwestern Mexico. Seven subspecies are currently recognized, including the nominate subspecies described here....

, a venomous pitviper species found in North America in the western United States, parts of British Columbia and northwestern Mexico.
Crotalus viridis
Crotalus viridis
Crotalus viridis is a venomous pitviper species native to the western United States, southwestern Canada, and northern Mexico. Currently, nine subspecies are recognized, including the nominate subspecies described here.-Description:...

, a.k.a. the prairie rattlesnake, a venomous pitviper species native to the western United States, southern Alberta, Canada, and northern Mexico.

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