Links to Christmas Bird Counts in Marin, Sonoma, and San Francisco

Marin Christmas Bird Counts
Sonoma Christmas Bird Counts
SF and Oakland - Golden Gate Audubon
Other Christmas Bird Counts in California 
Nature Alley has a list of all the CBC's in California, with contact information for each: http://natureali.org/cbcs.htm

National Audubon Christmas Bird Count 
https://www.audubon.org/conservation/science/christmas-bird-count