November 1977 – vol. 70, issue 11, pp 498–499 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... This article is only available to registered users.To read more, please log in or purchase a subscription.