RobinHood Posted January 7, 2019 Share Posted January 7, 2019 Southern Ontario, a few days ago. I think this is a juvenile Glaucous Gull. Thanks. Quote Link to comment Share on other sites More sharing options...
akiley Posted January 7, 2019 Share Posted January 7, 2019 Yes, although first-winter or first-cycle may be a better term. 1 Quote Link to comment Share on other sites More sharing options...
Sean C Posted January 7, 2019 Share Posted January 7, 2019 Agreed 1 Quote Link to comment Share on other sites More sharing options...
RobinHood Posted January 8, 2019 Author Share Posted January 8, 2019 15 hours ago, akiley said: Yes, although first-winter or first-cycle may be a better term. Thanks akiley. I went with juvenile because the fairly uniform darker coloration seemed to match with the Sibley juvenile (Aug-Apr). Still lots to learn about gulls. Quote Link to comment Share on other sites More sharing options...
Tony Leukering Posted January 13, 2019 Share Posted January 13, 2019 Yes, many of the arctic-breeding large, white-headed gulls have a delayed preformative molt, with many individuals found on winter grounds being in what is, essentially, full juvenile plumage. However, that preformative molt is often/usually commenced before February, thus it can be tricky to differentiate between juveniles and some immatures (non-adult birds that have replaced at least some juvenile plumage) in mid-winter. Thus, first-cycle is a safer term, though the bird does looks like its almost entirely in juvenile plumage. 1 Quote Link to comment Share on other sites More sharing options...
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