The fine bill, distinctive face pattern and rounded crown give the warbler (plate 123, page 456, repeated at reduced size here) the look of a typical Phylloscopus. Without wing-bars or prominent supercilium, it looks rather ordinary, and there is nothing about its structure to suggest other than a Willow Warbler P. trochilus or Chiffchaff P. collybita. The careful observation needed to separate th

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