Lansdown, P / August 1996 – vol. 89, issue 8, pp 361–362 The aims of this feature, which we inaugurated almost 20 years ago, in December 1976 (Brit. Birds 69: 495), have been not only to provide an entertaining puzzle, but also to focus attention on a series of identification problems, with instructive and educational texts by a variety of experts. The idea has since been copied by a score of other journals and magazines worldwide -- and we are appropri... This article is only available to registered users.To read more, please log in or purchase a subscription.