Article du Bulletin
Ground-dwelling Squirrels of the Pacific Northwest
Yensen E. and Sherman P. W. · 2003 · U.S. Fish & Wildlife Service, Snake River Fish and Wildlife Office, Bureau of Land Management, Spokane District Office, Bureau of Land Management, Oregon State Office, Boise, Idaho, USA, 35 pp.
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Résumé
In the Pacific Northwest there are 19 species of grounddwelling squirrels, belonging to 5 evolutionary groups. Idaho has the most species (13), followed by Oregon (10) and Washington (8). Seven species occur only in Washington, Oregon, or Idaho, and the other 12 have ranges that extend beyond the Pacific Northwest (although this guide includes only distributions in the 3 target states). Prairie dogs do not occur in Washington, Oregon, or Idaho, but there are 8 species of chipmunks (which are distantly related). Chipmunks are readily recognizable by their small size, long, thin tail, multiple stripes on the back, sides, and face, and semiarboreal habits. Chipmunks are not included in this guide.