Bird or Buoy?

So, we were at Park Point on Sunday. It was pretty far away and after a 45 minute walk on the sand we finally realized what it was. Can you tell?
(picture by Michael Kehn)

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A closeup, definitely not a buoy. It stayed on that piece of ice for 45 minutes before it lifted off and graced the sky with its presence.

Over the Harbor, click for more detail.

Close-up.

Thanks to Michael Kehn for the photos. If you want to use these photos please contact him directly.