Juvenile Male Red-bellied Gull

Yes folks, it is a Buoy Gull.*

Red-bellied gulls are fairly uncomon but may be spotted most frequently in their preferred habitat of marinas and inland boating lochs.  The yellow-bellied gull is a common variant but is not considered a separate species.

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* Our friends across the pond should note that what you call a 'booee' is pronounced 'boy' over on this side.