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Ficheiro:Lesser Black-backed Gull and Ring-billed Gull.jpg

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Ficheiro:Find the Iceland Gull (kumlieni) and the Lesser Black-backed Gull.jpg

267 3461 2070 Iceland Gull 3130 430 328 365 3461 2070 Lesser Black-backed Gull 1055 291 1524 1559 3461 2070 Ring-billed Gulls English determination method:...


Ficheiro:Lesser Black-backed Gulls with Ring-billed Gulls.jpg

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Ficheiro:Lesser Black-backed Gull with Goldeneye and Ring-billed - memory.jpg

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Ficheiro:The Auk 1884 Volume 1 (IA auk1884amer).pdf

The Auk 1884 Volume 1 (page 18 crop).jpg...


Ficheiro:Life Histories of North American Diving Birds.djvu

https://archive.org/details/cu31924090252846 Author Arthur Cleveland Bent Permission (Reusing this file) Other versions File:Great Auk Egg Bent.jpg – extracted...