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Sialia mexicana
Female W. Bluebirds are less colorful then the males. This one (and it may have been the light) was real pale in color. Smaller then Robins but bigger then Warblers. These you can see them sitting on branches or fences and swoop down and almost hover a spot where they may see an insect.
Open areas like fields, hillsides with some trees or fences for perching
Yes I'm on the Rare Bird Calif. email list and they get way more species then we do. I missed a Lesser Black-backed Gull that was in a parking lot of a marina. Both times I visited the site the other birders said someone had scared the bird off. After that the bird didn't come back.
I was going by eBird. I was implying Mountain would be a nice spotting considering the population of the San Francisco metro. It was more of a general comparison between Mountain and Western than an actual statement.
However, I know eBird doesn't cover every spotting and I absolutely trust your local knowledge. :)
Funny you should mention the bird movement, Ashley and I were just conversing about that.
I have a friend in Los Angeles, Dinuk, who seems to find a rare bird every time he's out!
Liam I'm not saying your wrong though. I believe your right on this. Since the climate changes we have been getting many species we're not suppose to have like the Tufted Duck, Tropical Kingbird, Baltimore Oriole, Cape May and many more.
Actually Mountian Bluebirds have been spotted in the higher elevations (high hills included) of the East Bay Area. Some in Briones, Las Trampas and Patterson Pass east of Livermore.
Too dark for Mountain. Western is also over 10x more likely in the 'Frisco area. Mountain would be a very nice sighting for the area.