The San Diego County Bird Atlas is a project of the San Diego Natural History Museum.
400 volunteer observers worked from February 1997 to February 2002 using a grid of 479 square across this large county.
San Diego County has a very diverse bird population. They won the 2002’s America’s Birdiest City contest held by the American Birding Association
Yellow Warbler’s Breeding Range
Yellow Warbler’s Winter Range