Hello Jack, and others,
It may be that Ringed Plover has never been documented in California but
there is allways a first time. Have a look at the site below, that's what I
call a juvenile Semipalmated Plover:

http://www.birdpix.nl/album_page.php?pic_id=36696

Cheers, Norman

> Norman D.van Swelm wrote:
>
>> In that case Jack it confirms my view that your bird is a Ringed Plover
>> Charadrius hiaticula and not a Semipalmated. The bill seems too long for
>> Semipalmated as well.
>> All the best, Norman
> ==================================
>
> Norman,
>
> I don't wish to be contradictory, but I just spoke with Phil Unitt of the
> San Diego Natural History Museum on this, and he not only agrees that the
> bird is a Semipalmated Plover, but there has never been a documented
> sighting of the Common Ringed Plover in California.
>
> Thanks for forcing me to look more closely. I think I've learned a bit in
> this exchange.
>
> Be Well,
> --
> -- Jack --
> ==================================
> <http://shadetree-imaging.com/>
> Wildlife Photography with
> Emphasis on Birds
> ==================================
> Poway, California (San Diego Co.)
> N 32° 57'  W 117° 04'
> At 508' Elevation
> ==================================