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Hybridisation in gulls occurs quite frequently, although to varying degrees depending on the species involved. ==Hybrid large white-headed gulls== * Herring Gull and Lesser Black-backed Gull interbreed to a limited degree where their ranges overlap, producing birds of intermediate appearance, which could be confused with yellow-legged gulls. * Western Gull and Glaucous-winged Gull hybridise extensively in western North America. Evidence of genetic influence of each upon the other is found throughout the range of both species. This particular hybrid is sometimes known as the "Olympic gull", or "Puget Sound gull". * Herring Gull and Glaucous Gull hybridise to a limited extent in Greenland and Iceland. The offspring have been termed "Nelson's gull",〔Malling Olsen, Klaus and Hans Larsson (2003) ''Gulls of Europe, Asia and North America'' Helm Identification Guides ISBN 0-7136-7087-8, page 193-4〕 but are sometimes also known as "Viking gull". * Herring Gull and Glaucous-Winged Gull hybridize extensively in southern Alaska. The offspring are sometimes termed "Cook Inlet Gull". * Glaucous-Winged Gull and Glaucous Gull hybridize in western Alaska. These hybrids are sometimes called "Seward" Gull. * Herring Gull and Kelp Gull have hybridized in Louisiana. This combination has been termed "Chandeleur" Gull. This hybrid is interesting as Louisiana is outside of the normal breeding range of both parent species. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hybridisation in gulls」の詳細全文を読む スポンサード リンク
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