Chestnut-backed chickadee Poecile rufescens

Rather dark, richly-colored chickadee of the Pacific Northwest. Small, big-headed, and tiny-billed, much like other chickadees, but reddish-brown back and brownish sides are unique. Prefers humid forests, often with dense conifers and oaks; also sometimes in shrubs in suburban areas. Often in flocks, sometimes mixed with other small songbirds. Visits feeders.