Bend Oregon during a visit with my sister Canon Powershot SX10IS
Mountain Chickadee inhabits mostly montane coniferous forests; like other chickadees it often joins mixed foraging flocks in the non-breeding season.
Although its populations are somewhat irruptive, as with Black-capped Chickadee, movements are mostly altitudinal; few birds have been recorded foar out of range, but some do move into the western Great Plains after breeding.
VOICE SONG a plaintive _see-bee-, similar to Black-capped but often with additional bee notes on same pitch as first bee note. CALLS also similar.