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| | Gulls of Europe, Asia and North America - Wikipedia, the free encyclopedia |
 | | Gulls of Europe, Asia and North America by Klaus Malling Olsen and Hans Larsson is a volume in the Helm Identification Guides series of bird identification books. |
 | | In addition, three Southern Hemisphere species which have occurred as vagrants in the northern hemisphere (Band-tailed Gull, Grey Gull and Swallow-tailed Gull) are covered more briefly in an appendix, with a single photograph each, and brief mention is also made here of Silver Gull which has occurred as an escape from captivity. |
 | | On page 21, the illustration of a gull's head, with a pointer highlighting an ear-spot, shows a bird with a full hood; ear-spots are a feature which appears on hooded gulls only when the hood (a feature of breeding plumage) is lost, in winter. |
| en.wikipedia.org /wiki/Gulls_of_Europe,_Asia_and_North_America (649 words) |
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