La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	From the Rarities Committee's files Identification of Caspian Gull Part 1: typical birds
Auteurs :	Chris Gibbins, Auteur ; Brian J. Small, Auteur ; John Sweeney, Auteur
Type de document :	Article
Dans :	British Birds (103(3) MAR 2010)
Article en page(s) :	142-183
Résumé :	This paper deals with the identification of the Caspian Gull Larus cachinnans. The aim is to synthesise what is currently known about the identification of this species and discuss the appearance of proven and suspected hybrids. The paper is split into two parts. Part I deals with the identification of typical cachinnans and their separation from Herring L. argentatus and Yellow-legged L. michahellis Gulls. It is targeted at non-specialists who remain unsure of the most reliable identification criteria, and at local records committees who need a structured basis for assessing claims. The paper covers all age groups, but concentrates particularly on those treated in less detail in the published literature. It includes a summary table that distils key information and ranks criteria according to their value in field identification. Part 2, to be published in a future issue, will deal with the identification of less typical individuals and hybrids.

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