https://www.pbase.com/gregbirder/image/98182166/
Western Bluebird photo - Greg Gillson photos at pbase.com
western bluebirdphotogregpbase
https://www.kqed.org/science/29607/western-bluebird-populations-expand-in-the-bay-area
Western Bluebird Populations Expand in the Bay Area | KQED
After their populations plunged in the mid-20th century, bluebirds have made a comeback with help from volunteers who make and monitor nest boxes.
the bay areawestern bluebirdpopulationsexpandkqed
https://www.fws.gov/apps/media/western-bluebird-sialia-mexicana
Western Bluebird (Sialia mexicana) | FWS.gov
western bluebirdsialiamexicanafws