. The descent of man, and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings; Sexual selection in animals; Sexual dimorphism (Animals); Sex differences. -MAMMALS. 591 together, as do the tusks of boars. Although wild boars fight desperately, they seldom, according to Brehm, receive fatal wounds, as the blows fall on each other's tusks, or on the layer of gristly skin covering the shoulder, called by the German hunters the shield; and here we have a part specially modified for defense. With boars in the prime of life (fig. 65) the tusks in the lower jaw are used
. The descent of man, and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings; Sexual selection in animals; Sexual dimorphism (Animals); Sex differences. -MAMMALS. 591 together, as do the tusks of boars. Although wild boars fight desperately, they seldom, according to Brehm, receive fatal wounds, as the blows fall on each other's tusks, or on the layer of gristly skin covering the shoulder, called by the German hunters the shield; and here we have a part specially modified for defense. With boars in the prime of life (fig. 65) the tusks in the lower jaw are used for fighting, but they become in old age, as Brehm states, so. yig. 66. Skull of the Babirusa Pig (from Wallace's " Malay Archipelago"). much curved inward and upward over the snout that they can no longer be used in this way. They may, however, still serve, and even more effectively, as a means of defense. In compensation for the loss of the lower tusks as weapons of offense those in the upper jaw, which always project a little laterally, increase in old age so much in length and curve so much upward that they can be used for attack. Nevertheless, an old boar is not so dangerous to man as one at the age of six or seven years. * " « B-*.Um '' ; B~"ii. ;729.^^m ^"". 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 : A. L. Burt
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Keywords: ., bookcentury1800, bookdecade1870, booksubjecthumanbeings, bookyear
