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Farm Bill Biologist. Worked in natural resources at local, state, and tribal levels. B.S. in Fisheries and Wildlife Management from LSSU.
Buchanan, MISign In to follow
Yes, the bird in question was centered in the foreground. I guess I should have clarified that. Those markings you described are my reasoning for thinking it's a Thayer's. My understanding with the back is that color can vary, also the overcast does make it darker. From the research I have done, the wing tips are the most important marker on a Thayer's gull, and I feel like they are too dark, though they do look different than the herring wing tips. Unfortunately I did not notice this bird in the field, just seen in my pictures once home, so I don't have another look at it.
Thank you. Now that I think about it, I'm guessing both pictures are probably the same bird. Pictures were taken in roughly the same location, a few hours apart. One seemed smaller, and a different angle made me think it was a different species.