Abstract
Yellow-pine chipmunks, Eutamias amo,enus, and Townsend's chipmunks, E. townsendii, were live-trapped in the subalpine zone in Mount Rainier National Park, Washington. Home ranges overlapped, both intraand interspecifically. Tree islands offered the most dense and least variable cover. Talus slides were not analyzed, but were considered to have a high quality cover due to their structure. Both species were significantly more abundant in tree islands than in other cover types. E. townsendii males were significantly more abundant in talus slides than E. amoenus males and females. Niche separation of the two chipmunks on the basis of cover utilization is implied.
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