The Rocky Mountain Wood Tick (Dermacentor andersoni) is a common tick found in the western United States and parts of Canada. It typically inhabits grassy and wooded areas, where it waits for a host to pass by. This tick is known for its role in transmitting diseases, including Rocky Mountain spotted fever and tick-borne encephalitis. Adult Rocky Mountain Wood Ticks are usually active from spring to early summer. They can be identified by their reddish-brown color and distinctive white markings on their backs. Proper precautions, such as wearing protective clothing and using insect repellent, can help prevent tick bites when spending time outdoors.