The Descent of Man and Selection in Relation to Sex, Vol. II (1st Edition)Darwin, Charles
Science
The Descent of Man and Selection in Relation to Sex, Vol. II (1st Edition)
Darwin, Charles
Evolution (Biology); Human beings -- Origin; Sex differences; Sexual dimorphism (Animals); Sexual selection in animals
Each male animal uses his weapons in his own peculiar fashion. The
common ram makes a charge and butts with such force with the bases of
his horns, that I have seen a powerful man knocked over as easily as a
child. Goats and certain species of sheep, for instance the _Ovis
cycloceros_ of Afghanistan,[305] rear on their hind legs, and then not
only butt, but “make a cut down and a jerk up, with the ribbed front of
their scimitar-shaped horn, as with a sabre. When the _O. cycloceros_
attacked a large domestic ram, who was a noted bruiser, he conquered him
by the sheer novelty of his mode of fighting, always closing at once
with his adversary, and catching him across the face and nose with a
sharp drawing jerk of his head, and then bounding out of the way before
the blow could be returned.” In Pembrokeshire a male goat, the master of
a flock which during several generations had run wild, was known to have
killed several other males in single combat; this goat possessed
enormous horns, measuring 39 inches in a straight line from tip to tip.
The common bull, as every one knows, gores and tosses his opponent; but
the Italian buffalo is said never to use his horns, he gives a
tremendous blow with his convex forehead, and then tramples on his
fallen enemy with his knees—an instinct which the common bull does not
possess.[306] Hence a dog who pins a buffalo by the nose is immediately
crushed. We must, however, remember that the Italian buffalo has long
been domesticated, and it is by no means certain that the wild
parent-form had similarly shaped horns. Mr. Bartlett informs me that
when a female Cape buffalo (_Bubalus caffer_) was turned into an
enclosure with a bull of the same species, she attacked him, and he in
return pushed her about with great violence. But it was manifest to Mr.
Bartlett that had not the bull shewn dignified forbearance, he could
easily have killed her by a single lateral thrust with his immense
horns. The giraffe uses his short hair-covered horns, which are rather
longer in the male than in the female, in a curious manner; for with his
long neck he swings his head to either side, almost upside down, with
such force, that I have seen a hard plank deeply indented by a single
blow.
[Illustration: Fig. 61. Oryx leucoryx, male (from the Knowsley
Menagerie).]
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