World Bird List

Species factsheet
Boreal Chickadee (Poecile hudsonicus)

Order: Poecile hudsonicus
Family: Tits, Chickadees (Paridae)

Voices can be found here (external link)
Subspecies and Distribution
Subspecie Distribution
stoneyi n Alaska and nw Canada
columbianus s Alaska, w Canada to n Washington (nw USA)
hudsonicus c Alaska to e Canada
littoralis se Canada and ne USA
farleyi sc Canada