. The descent of man, and selection in relation to sex. Evolution (Biology); Sexual selection in animals; Sexual dimorphism (Animals); Sex differences; Human beings. 253 SEXUAL SECECTION: MAMMALS. [Part IL little latcrnlly, increase so much in length during old age, and curve so much upward, that they can be used as a means of attack. Nevertheless an old boar is not so dan- gerous to man as one at the age of six or seven ;* In the full-grown male Babirusa pig of Celebes (Fig. 64), the lower tusks are formidable weapons, like those of. Fig. 64.—Skull ol the babirtiga Pig (from Wallac
. The descent of man, and selection in relation to sex. Evolution (Biology); Sexual selection in animals; Sexual dimorphism (Animals); Sex differences; Human beings. 253 SEXUAL SECECTION: MAMMALS. [Part IL little latcrnlly, increase so much in length during old age, and curve so much upward, that they can be used as a means of attack. Nevertheless an old boar is not so dan- gerous to man as one at the age of six or seven ;* In the full-grown male Babirusa pig of Celebes (Fig. 64), the lower tusks are formidable weapons, like those of. Fig. 64.—Skull ol the babirtiga Pig (from Wallace's ' Malay Archipelago'). the European boar in the prime of life, while the upper tusks are so long and have their points so much curled inward, sometimes even touching the forehead, that they are utterly useless as weapons of attack. They more near- ly resemble horns than teeth, and are so manifestly useless as teeth that the animal was formerly supposed to rest his head by hooking them on to a branch. Their convex « Brehm, ' Thierleben,' B. ii. s. "729, " 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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