March 1991 – vol. 84, issue 3, pp 106–107 With the same issue containing a 'Mystery photographs' text and photographs relating to Mediterranean Gull Larus melanocephalus (Brit. Birds 83: 561-564, plates 302 & 303), was plate 306 a simple problem, or a trap? Clearly, quite a number of entrants thought the latter: Mediterranean Gull (59%) Grey Phalarope Phalaropus fulicarius (16%) Black-headed Gull L. ridibundus (12%), with fewer votes ea... This article is only available to subscribed users.To read more, please log in or purchase a subscription.