San Diego County, California, US
american golden plover?
Here are two Black-bellied Plovers from a flock of about two dozen that were feeding and perching on rocks along the edge of Port Townsend Bay. They have just returned from the farthest north of Alaska and Canada, and some males even still show the remnants of their breeding plumage-- the black bellies. Not these two.
The Grey Plover (Pluvialis squatarola), known as the Black-bellied Plover in North America, is a medium-sized plover breeding in arctic regions. It is a long-distance migrant, with a nearly worldwide coastal distribution when not breeding.