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| First Cycle Thayer's Gull |
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| First Cycle Thayer's & Herring Gull |
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| A bit too pale for my Thayer's gauge. Photo 1 of 4. |
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| Center. Photo 2 of 4. |
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| Photo 3 of 4. |
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| Photo 4 of 4. |
Here's another that I struggled with. A foreign-looking eye placement as well as an oddly sloped forehead:
I suppose 2nd cycle Kumlien's Gull will do, but it threw me...
Lake County, Illinois. 18 December 2015.
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| Adult Thayer's. |
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| Adult Thayer's. Photo 1 of 2. |
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| Photo 2 of 2. |
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| Near Adult Thayer's. Photo 1 of 2. |
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| Photo 2 of 2. |
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| Intermediate Adult Thayer's/Kumlien's. Wingtips too pale for THGU. Photo 1 of 2. |
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| Left wingtip more representative of color. Photo 2 of 2. |