Small body + 1⅛" panel
Body sized to 4"×4" floor. The 1⅛" panel locks out larger nest competitors while letting the Chestnut-backed Chickadee pass cleanly.
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Poecile rufescens
Vibrant chestnut-backed chickadee of damp Pacific coastal forests, with a rusty back and flanks set against the standard black cap. Often the most common bird in mature Douglas-fir stands.
Widespread and abundant; no known immediate threats to the population.
The most colorful North American chickadee, rich chestnut back and flanks contrast with the typical black cap and bib.
Lines nests almost entirely with moss and hair, sometimes including fur shed by deer or rabbits.
A coastal specialist found nowhere east of the Cascade crest, tightly tied to wet conifer forests.
Frequently joins mixed-species winter flocks with kinglets and nuthatches.
Restricted to the wet Pacific Coast forest band from south-central Alaska to coastal central California, plus a disjunct population in the northern Rockies.
Common breeder along the Alaska panhandle, coastal BC, Washington, Oregon, and into the redwood and Douglas-fir zones of northern California.
An isolated resident population in the wet cedar–hemlock forests of northern Idaho and northwestern Montana.
Body sized to 4"×4" floor. The 1⅛" panel locks out larger nest competitors while letting the Chestnut-backed Chickadee pass cleanly.
Uses moss and fur to line nests, keep nesting cup deep.