Location in Oregon
Blue is Winter range - Red is Summer range
Purple is Year-round range - Yellow is Migration range

Black-capped Chickadee

Poecile atricapillus - This common black-capped species is told from the Carolina, whose range it may invade in winter, is by its rustier sides, white feather edges on wing, and whiter cheek patches. Whistled song is easily imitated; second note is 1 full tone lower.