Small body + 1⅛" panel
Body sized to 4"×4" floor. The 1⅛" panel locks out larger nest competitors while letting the Mountain Chickadee pass cleanly.
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Poecile gambeli
Conifer-specialist chickadee of the western mountains, recognizable by the bold white eyebrow stripe. Smaller and more vocal than its eastern cousins, often heard before seen.
Widespread and abundant; no known immediate threats to the population.
Caches thousands of food items every fall and remembers each cache location through the winter, their hippocampus actually grows in autumn to handle the memory load.
Lives at higher elevations than any other North American chickadee, regularly nesting above 10,000 ft in the Rockies.
The white eyebrow stripe makes them instantly distinguishable from Black-capped Chickadees in overlap zones.
Pairs stay together year-round and defend the same nesting territory for multiple seasons.
Resident throughout the mountainous western US and southwestern Canada, from the eastern Cascades and Sierras across the Rockies to the Mogollon Rim in Arizona and New Mexico.
Common breeder from the southern Yukon and BC south through Idaho, Montana, Wyoming, Colorado, and into northern Mexico.
Resident in conifer forests of Nevada, Utah, eastern Oregon, and the Sierra Nevada of California.
Year-round in the highlands of Arizona and New Mexico, descending in winter to lower-elevation pine-oak zones.
Body sized to 4"×4" floor. The 1⅛" panel locks out larger nest competitors while letting the Mountain Chickadee pass cleanly.
Cavity adopter, uses old woodpecker holes and nest boxes interchangeably.