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 ...

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