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  1. Kirk Roth

    Convergence of IOC, Clements and BirdLife Taxonomies?

    I can weigh in on Thayer's/Kumlein's Iceland Gulls in the Great Lakes region in winter - they are certainly both expected winter species in the same areas and do come into contact. But the bigger issue is that you have to draw a very arbitrary line in plumage color to be able to state that they...
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