December 2020 – vol. 113, issue 12, pp 792–796 Abstract A putative Willow Warbler Phylloscopus trochilus × Common Chiffchaff P. collybita hybrid present at Draycote Water, Warwickshire, from 27th May to 15th July 2019 is described. The bird’s song superficially resembled that of an Iberian Chiffchaff P. ibericus. Mixed-singing and song-switching behaviour in hybrids is discussed. IntroductionOn 27th May 20... This article is only available to registered users.To read more, please log in or purchase a subscription.