. The descent of man, and selection in relation to sex. Evolution (Biology); Sexual selection in animals; Sexual dimorphism (Animals); Sex differences; Human beings. 286 SEXUAL SELECriON : MAMMALS. [Pabt IL the throat, tlie white marks on tlie fetlocks, and tlie round hhick s{)ot8 on the ears, are all more distmct in the male of the Portax. picta^ than iu the female—when we see that the colors are more vivid, that the narrow white lines on the flank and the broad white bar on tlie shoulder are. Fio. 69.—Damalis pygarga, male (from the Knowsley Menajrerie). more distinct in the male Oreas Derby
. The descent of man, and selection in relation to sex. Evolution (Biology); Sexual selection in animals; Sexual dimorphism (Animals); Sex differences; Human beings. 286 SEXUAL SELECriON : MAMMALS. [Pabt IL the throat, tlie white marks on tlie fetlocks, and tlie round hhick s{)ot8 on the ears, are all more distmct in the male of the Portax. picta^ than iu the female—when we see that the colors are more vivid, that the narrow white lines on the flank and the broad white bar on tlie shoulder are. Fio. 69.—Damalis pygarga, male (from the Knowsley Menajrerie). more distinct in the male Oreas Derby arms than in the fe- male—when we see a similar difference between the sexes of the curiously ornamented Tragelaphus scriptus (Fig, 68)—we may conclude that these colors and various marks have been at least intensified through sexual selec- tion. It is inconceivable tliat such colors and marks can be of any direct or ordinary service to those animals; and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Darwin, Charles, 1809-1882. New York, D. Appleton and company
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Keywords: ., bookcentury1800, bookdecade1870, booksubj, booksubjecthumanbeings
