Gulls of Europe, Asia and North America

ISBN: 9780713670875 出版年：2010 页码：607 Klaus Malling Olsen Bloomsbury Publishing

The standaidentification of the northern hemisphere's gulls, ththe plumage variation through age and subspecies of all 80 species in the region. With exhaustive coverage, detailed maps, and superb plates and photos, this book remains the definitive work on these birds, which represent the trickiest of all ID challenges.