Whatbird.com

What kind of bird is this:  http://www.youtube.com/watch?v=E0dZH-iKz48 ?  I found it on the beach in Pensacola Beach, Fl, and have seen them a few times.  They kind of flop up on the shore and just lay there like they are injured, but they aren't actually sick or injured at all.  Their legs are really far back too.

I have a question. I've been trying to find out what kind of birds I saw landing in my neighbor's tree a couple weeks back. I didn't think much of it other than it was too cold to see robins because of the bitter temps we've been having this winter. Then I saw an article in the newspaper about how birds from Canada and the Arctic are here in New ...