A few examples from last week:
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p9-p10 still growing as are the inner secondaries. Lake County, Illinois. 19 Nov 2017. Photo 1 of 2. |
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Same individual above. Photo 2 of 2. |
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Thayer's. A relatively small p9 mirror. p10 growing as are many inner secondaries. |
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A paler individual showing thayeri and kumlieni wingtip characterisitcs. P9 almost fully grown. P10 still growing. Lake County, IL. 19 Nov 2017. |
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A Kumlien's type. P10 still growing. Secondaries fully grown. Lake County, IL. 19 Nov 2017. |
These next two individuals are from Lake Superior a week later. I was reassured by Peder Svingen that a good number of early Iceland Gulls (namely, thayeri subspecies) arrive in the Fall with p9/p10 growing on Lake Superior. His impression of their molt state was similar to mine with Lake Michigan birds.
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Thayer's. Primaries grown but the secondaries are delayed. Douglas County, WI. 25 Nov 2017. |
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Thayer's. P10/p9 growing. Inner secondaries also molting. Douglas County, WI. 25 Nov 2017. |