July 1936 – vol. 30, issue 8–56 S I R S , -- I have often been struck by the apparent differences in colour of Lesser Black-backed Gulls on the Clyde. On May gth, 1936, a t 9.30 a.m. (summer time) I watched half a dozen of these Gulls sitting on a railing on Dunoon pier within a few yards of me. The railing was so placed t h a t the Gulls were turned either directly to the sun or directly away from it. Those facing the sun appea... This article is only available to registered users.To read more, please log in or purchase a subscription.