Identification of Slaty-backed Gull Larus schistisagus: a North American Perspective


sbgu_feb16_2015 First-winter Slaty-backed Gull Larus schistisagus, Busan, February 16th 2015 © Nial Moores

For those who are really into the wonderful world of gulls and gull identification, the following paper in Birding on Slaty-backed Gulls might be of some interest:


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