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| Glaucous Gull (2nd cycle). Michigan City, Indiana. 23 Dec 2013. |
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| Thayer's Gull (adult). Michigan City, Indiana. 23 Dec 2013. |
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| All black bill in 2nd cycle, piercing yellow eye and u-shaped tail-band superficially resemble Slaty-backed. |
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| The gray scapulars were awfully pale, suggesting the bird is most likely an odd Herring-type. |