Walked out to Coal Oil Point after work and found 200 + Black-bellied Plovers hunkered down in the roped off flat area at the mouth of the slough (counted to 190 or so then got lazy but easily 20-30 more). Looked through them as best I could but could not pick out anything different. Also a fair number of Sanderling, Semi-palmated Plover and Snowy Plover. Smaller numbers of Whimbrel, Western Sandpiper, Black Turnstone and Long-billed Dowitcher were present. It was an impressive accumulation of birds.