Regarding Brewer's Sparrows at high elevations, the nominate race
certainly occurs at 6700' (near treeline) on Mt. Kobau near Osoyoos, BC.
What is critical for that form, apparently, is the availability of
sagebrush. Timberline Sparrows are found in willow-birch subalpine habitats.

Richard J. Cannings cannings at bcu.ubc.ca
Cowan Vertebrate Museum vertmus at bcu.ubc.ca
Department of Zoology, (604)822-4665
University of British Columbia (604)822-2416 (FAX)
Vancouver, BC V6T 1Z4 CANADA