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To please or excite the female are under ordinary circumstances accepted. If this be admitted there is not much difficulty in understanding how male birds have gradually acquired their ornamental characters. All animals present individual differences and as man can modify his domesticated birds by selecting the individuals which appear to him the most beautiful so the habitual or even occasional preference by the female of the more attractive males would almost certainly lead to their modification; and such modifications might in the course of time be augmented to almost any extent compatible with the existence of the species. VARIABILITY OF BIRDS AND ESPECIALLY OF THEIR SECONDARY SEXUAL CHARACTERS. Variability and inheritance are the foundations for the work of selection. That domesticated birds have varied greatly their variations being.
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