Recorded at Castle Rock Park, Walnut Creek, California. 12 April 2010 at 7:00 pm after heavy rains, then sunshine.
Background noise include rushing of creek, possibly cattle calls.
Here are the main species to listen for and identify: Bullock's Oriole (calls only, no song), Acorn Woodpecker, Western Scrub Jay, House Wren, Western Kingbird, House Finch, Audubon's Yellow-rumped Warbler, Oak Titmouse, Golden-crowned Sparrow and Lesser Goldfinch. Any others? Good Luck.