Archive image from page 264 of The descent of man, and. The descent of man, and selection in relation to sex descentofmansele000darw Year: 1971 Chap. XVII.] MEANS OF DEFENCE. 253 surfaces would, however, if the head were held a little laterally, serve as an excellent guard; and hence, per- haps, it is that in old animals they ' are generally broken off, as if by lighting.' 36 Here, then, we have the curious case of the upper tusks of the Babirusa regularly assum- ing, during the prime of life, a structure which apparently renders them fitted only for defence; while in the Euro- pean boar the
Archive image from page 264 of The descent of man, and. The descent of man, and selection in relation to sex descentofmansele000darw Year: 1971 Chap. XVII.] MEANS OF DEFENCE. 253 surfaces would, however, if the head were held a little laterally, serve as an excellent guard; and hence, per- haps, it is that in old animals they ' are generally broken off, as if by lighting.' 36 Here, then, we have the curious case of the upper tusks of the Babirusa regularly assum- ing, during the prime of life, a structure which apparently renders them fitted only for defence; while in the Euro- pean boar the lower and opposite tusks assume in a less degree and only during old age nearly the same form, and then serve in like manner solely for defence. iiiwi i run i inn oravi uw (wrowuw ui mi ii redtK '-d nciile. the chiiructi iH ol tin- mule i Iii the wart-hog (P/ntcnr/iocrus a-thhtpirus, Kig. the tusks in the upper jaw of the male ourve upward dur- ing the prime of life, and, from being pointed, serve ai for midahlc weapons. The tusk- in the lower ja sre sharper ihan thorn- in the upper, hut from their Bhortnesi it leemi hardly possible thai they can be a Bed as weapons of at tack. They must, however, greatly itrengthen those in the â ⢠Soe Mr. Wallace' Intcrontlng account of thlft animal, 1 Thi Kslsj Archipelago,' 1800, vol. I. p. 135.
Size: 1739px × 1150px
Photo credit: © Actep Burstov / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: 1900, 1970, 1971, archive, book, bookauthor, bookcentury, bookdecade, bookpublisher, booksubject, bookyear, darwin_charles_1809_1882, drawing, evolution_biology_, historical, history, human_beings, illustration, image, new_york_d_appleton_and_company, page, picture, print, reference, sex_differences, sexual_dimorphism_animals_, sexual_selection_in_animals, vintage
