World Bird List

Species factsheet
Mountain Chickadee (Poecile gambeli)

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

Voices can be found here (external link)
Subspecies and Distribution
Subspecie Distribution
baileyae Pacific slope of the Rocky Mts. in w USA and w Canada
inyoensis central Rocky Mts. in w USA
gambeli e Rocky Mts. in wc USA
atratus nw Mexico