A worldwide community photographing and learning about wildlife
Sayornis nigricans
Ian, Black-tailed Godwits (ABA Code 3) and Asiatic Dowitchers (ABA Code 6) would be extremely rare in California. The Marbled Godwit and Willet are two very common species on California beaches.
http://en.wikipedia.org/wiki/Marbled_God...
http://en.wikipedia.org/wiki/Willet
Could be willet... Did you see them fly? Willets have black wings with white stripes. Otherwise they're kinda nondescript.