. The descent of man, and selection in relation to sex. Evolution; Heredity; Human beings; Natural selection. CHAP. MAMMALS—SPOTS AND STRIPES. 567 white bar on the shoulder are more distinct in the male Oreas derbyanus than in the female ; when we see a similar difference between the sexes of the curiously ornamented Tragelaphus scriptus (fig. 70), we cannot believe that differences of this kind are of any service to either sex in their daily habits of life. It seems a much more probable conclusion that the various marks were first acquired by the males and their colors intensi* fied t
. The descent of man, and selection in relation to sex. Evolution; Heredity; Human beings; Natural selection. CHAP. MAMMALS—SPOTS AND STRIPES. 567 white bar on the shoulder are more distinct in the male Oreas derbyanus than in the female ; when we see a similar difference between the sexes of the curiously ornamented Tragelaphus scriptus (fig. 70), we cannot believe that differences of this kind are of any service to either sex in their daily habits of life. It seems a much more probable conclusion that the various marks were first acquired by the males and their colors intensi* fied through sexual selection, and then partially transferred to. Fig. 71.—Damalis pygargja, male (from the Knowsley Menagerie). the females. If this view be admitted, there can be little doubt that the equally singular colors and marks of many other ante- lopes, though common to both sexes, have been gained and transmitted in a like manner. Both sexes^ for instance, of the koodoo {Strepsiceros kudu) (fig. 64) have narrow white vertical lines on their hind flanks, and an elegant angular white mark on their foreheads. Both sexes in the genus Damalis are very oddly colored ; in D. pygarga the back and neck are purplish- led, shading on the flanks into black; and these colors are. 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 Hurst
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Keywords: ., bookcentury1800, bookdecade1870, booksubjecthumanbeings, bookyear
