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Charadrius vociferus
Plover type of bird on the lake shore.
My first thought was immediately " oh. A plover.". I don't have by bird book handy, but I'm quite certain that's what it is.
Killdeer are larger and lankier than Semipalmated and Wilson's plovers; the double breast band distinguishes adult Killdeer from these two species (and all other plovers). However, juvenile Killdeer have only one breast band and are often confused with these two species. Be sure to watch for signs of downy plumage, and look for the Killdeer to have pinkish legs and an all-black bill.