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The northern Pacific Rattlesnake, Crotalus viridis oreganus, is a venomous snake of the family Viperidae. The range of this species within British Columbia is restricted to the Ponderosa Pine and Bunchgrass biogeoclimatic zones which occur primarily in the Thompson and Okanagan basins, and the Nicola valley. At present we have little information regarding population sizes or overall population trends for C. v. oreganus in the province. However, the distribution of this species overlaps to a considerable degree with areas of extensive land development and there has likely been some negative impact on population numbers. The low reproductive rate of C. v. oreganus in British Columbia makes it particularly sensitive to large-scale disturbances, as populations may respond slowly to perturbations. In order to protect this species, further research on its basic biology is needed and should include: information on the locations of den sites from a wide range of sites in the province; long-term population monitoring
Charland, M.B., Nelson, K.J.; Gregory, P.T.. 1993. Status of the Northern Pacific Rattlesnake in British Columbia. Ministry of Environment, Lands and Parks. Species Status Report. WR54
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