Dark backed Gull
probable Herring x Great Black-backed Gull

Jodrey State Pier, Gloucester, MA

March 9, 2008

Comments Appreciated

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Pulling up on the pier mid-day found this bird, along with several Great Black-backed and Herring Gulls
harassing the Common Eider feeding between the boats. The gulls large size and mantle color, mid-way
between Herring & Great-Black-backed really made it stand out among the crowd.


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A note to Rick Heil confirmed my suspicions that this could be a hybrid.

"...looks good for a Herring X Great Black-backed hybrid.  Size and structure look roughly intermediate,
almost full white tip to P10 and small mirror on P9 good for such a combo..."


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Not clear in the photographs is the "light pink" leg color. The gull is not in active wing molt but has a
damaged outer primary, P10, on it's left wing (seen well in the 1st two photos below).


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All photos © Phil Brown 2008