Hendy, E. M, Campbell, J. W, Moffat, C. B, Robinson, H. W, Hendy, E. M, Robinson, H. W & Campbell, J. W / September 1937 – vol. 31, issue 8–128 SIRS,--I think Mr. David Lack is clearly right in concluding from the scene he describes (antea, p . 82) t h a t the crest of the Goldcrest (Regulus r. anglorum) is an instance of ornamentation functioning as a " threatcolour", and used for t h a t purpose in fight between rival males. In fact, I had myself brought forward this species (in m y article on t h e " Spring rivalry of b i r d s " , Irish ... This article is only available to registered users.To read more, please log in or purchase a subscription.