By J. Martin Collinson, Thomas Shannon, Paul Archer, Nigel Odin, Roger Riddington and Paul Walsh
Abstract The criteria for robust identification of migrant Siberian Chiffchaffs Phylloscopus collybita tristis in western Europe continue to prove controversial. Whereas many 'classic' birds are identifiable on the basis of plumage and vocalisations, many others are less straightforward. This article desc
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