La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Do Willow Warblers ‘chiff-chaff’ when they are cross?
Auteurs :	T. Fulford, Auteur
Type de document :	Article
Dans :	British Birds (110(5) 2017)
Article en page(s) :	278 - 295
Résumé :	Records of Phylloscopus warblers singing a mixture of Willow Warbler P. trochilus and Common Chiffchaff P. collybita songs are not uncommon. Of 11 mixed singers found recently in the Cambridge area, all were found to be Willow Warblers. The birds consistently delivered their Chiffchaff-type song 33% faster than true Chiffchaffs and their response to playback was generally more aggressive than that of Willow Warblers or Chiffchaffs with normal songs. It is suggested that such singing has become an integral part of the Willow Warbler's repertoire: a second song used by some individuals when they are particularly excited

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