Tuesday Neil Gilbert posted about a Chestnut-sided Warbler on the Orange County Birds mailing list:
I got October off to a good start with a very nice hatch-year CHESTNUT-SIDED WARBLER at Irvine Regional Park in Orange. I saw it near the entrance to the park. It was hanging out with an enormous flock of Yellow-rumped Warblers, Western Bluebirds, House Finches, and Lark Sparrows.
Now Chestnut-sided Warblers are actually reasonably frequent in migration in New York City parks, so this wasn’t a target bird for me. However the Lark Sparrows he mentioned almost in passing are not a common East Coast bird, and I’d never seen one, so Wednesday afternoon after work I hopped in the Prius and headed up Jamboree to Irvine regional Park. I got there about 6:00 and found his flocks of robins, bluebirds, and warblers. There were also lots of House Finches. However I did not find either the Chestnut-sided Warbler or the Lark Sparrows. :-(
Sometimes you have to keep trying though, so the next morning I made a 15-mile detour on the way to work and stopped in the park around 9:00 A.M. This time the flocks of Robins and Bluebirds had vanished, though there were more than usual numbers of Anna’s Hummingbirds. I drove around Sycamore Hill and as I was coming back to the entrance I heard an unusual call I didn’t recognize so I parked and hopped out.
I never did figure out what the call was, but by the baseball backstop I found four Lark Sparrows:
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