Which geographic range primarily hosts the distribution of Dermacentor andersoni?
Answer
Western United States and western Canada
The primary distribution of the Rocky Mountain Wood Tick, *Dermacentor andersoni*, is established firmly in western North America. This encompasses the western United States and western Canada. The text details its presence across numerous specific western states, including Montana, Wyoming, Idaho, Washington, Oregon, California, Utah, Nevada, Colorado, North Dakota, and South Dakota. This concentration in the West, often tied to mountainous terrain and specific elevation profiles, is a key characteristic distinguishing its geographic footprint from tick species found further east.

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