Archive image from page 299 of The descent of man, and. The descent of man, and selection in relation to sex descentofmansele187302darw Year: 1873 286 SEXUAL SELECTION: MAMMALS. [Paet II. the throat, the white marks on the fetlocks, and the round black spots on the ears, are all more distinct in the male of the Portax picta, than in 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 the shoulder are Fig. 69.—Damalis pygarga, male (from the Knowsley Menagerie). • more distinct in the male Oreas Derby anus than in the fe
Archive image from page 299 of The descent of man, and. The descent of man, and selection in relation to sex descentofmansele187302darw Year: 1873 286 SEXUAL SELECTION: MAMMALS. [Paet II. the throat, the white marks on the fetlocks, and the round black spots on the ears, are all more distinct in the male of the Portax picta, than in 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 the shoulder are Fig. 69.—Damalis pygarga, male (from the Knowsley Menagerie). • more distinct in the male Oreas Derby anus 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 that such colors and marks can be of any direct or ordinary service to these animals; and
Size: 1214px × 1647px
Photo credit: © Actep Burstov / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: 1800, 1870, 1873, archive, book, bookauthor, bookcentury, bookdecade, bookpublisher, booksubject, bookyear, darwin_charles_1809_1882, drawing, evolution, historical, history, human_beings_origin, illustration, image, natural_selection, new_york_d_appleton_and_co_, page, picture, print, reference, sexual_dimorphism_animals_, sexual_selection_in_animals, vintage
