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CHAPTER X - COLOURS AND ORNAMENTS CHARACTERISTIC OF SEX

Published online by Cambridge University Press:  29 August 2010

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Summary

In the preceding chapters we have dealt chiefly with the coloration of animals as distinctive of the several species; and we have seen that, in an enormous number of cases, the colours can be shown to have a definite purpose, and to be useful either as a means of protection or concealment, of warning to enemies, or of recognition by their own kind. We have now to consider a subordinate but very widespread phenomenon—the differences of colour or of ornamental appendages in the two sexes. These differences are found to have special relations with the three classes of coloration above referred to, in many cases confirming the explanation already given of their purport and use, and furnishing us with important aid in formulating a general theory of animal coloration.

In comparing the colours of the two sexes we find a perfect gradation, from absolute identity of colour up to such extreme difference that it is difficult to believe that the two forms can belong to the same species; and this diversity in the colours of the sexes does not bear any constant relation to affinity or systematic position.

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Darwinism
An Exposition of the Theory of Natural Selection, with some of its Applications
, pp. 268 - 300
Publisher: Cambridge University Press
Print publication year: 2009
First published in: 1889

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