godwits, avocets, and... unidentified

The Berkeley Marina is a spot from which one can, on a lucky day, see everything from an eared grebe to a white-tailed kite. The other day, I saw all of the following, and many others, from a single spot... a bunch of marbled godwits:

willets with muddy faces:

avocets:

a red-tailed hawk who fancied a day at the beach:

...plus greater scaups, lesser scaups, a pacific oystercatcher, and a snowy egret, plus of course vultures, crows, and western gulls... and one bird I cannot as yet identify.

My first thought was a sanderling, then I thought maybe least sandpiper... now it looks like, I don't know, a juvenile black-bellied plover?

Whatever it was, there were good numbers of them. Here's a blurry shot of one in flight.

....aaaaand then there's this , which at first I took for another of the same bird, but may be something different yet. I think it doesn't have a long curved bill, but is carrying something... (this is unfortunately a 100% crop).

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K10D, Sig 17-70, DA 55-300, FA 50/1.4 "Billy Bass", M 400/5.6 "the Great Truncheon"