Mixed flock of black-bellied plovers and ruddy turnstones, Robb Field, San Diego River, San Diego County, California, September 2009

Mixed flock of black-bellied plovers and ruddy turnstones, Robb Field, San Diego River, San Diego County, California, September 2009

Mixed flock of black-bellied plovers and ruddy turnstones, Robb Field, San Diego River, San Diego County, California, September 2009