Tricky tricky. It's obviously not in full plumage, but turns out that it does resemble another bird!!!! The Franklin's Gull! This bird in its first year plumage looks almost exactly the same! Again it came down to the tail feathers for me. The long black tail feathers at the end are signs of the Laughing while with the Franklin's Gull, we'll find some white "dotting" mixed into the end feathers. Putting that all aside, the easiest way to ID is from the gull's call. It sounds like a laugh which helped me pick up this lifebird number 338.
|Black-neck Stilt, Laughing Gull, Killdeer|