World Bird List

Species factsheet
Oak Titmouse (Baeolophus inornatus)

Order: Baeolophus inornatus
Family: Tits, Chickadees (Paridae)

Voices can be found here (external link)
Subspecies and Distribution
Subspecie Distribution
inornatus sw Oregon to c California (w USA)
affabilis sw California (sw USA) and n Baja California (nw Mexico)
mohavensis se California (sw USA)
cineraceus s Baja California (nw Mexico)