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
After performing these antics the
males begin to fight: and the same black-cock, in order to prove his
strength over several antagonists, will visit in the course of one
morning several Balz-places, which remain the same during successive
years.[72]
The peacock with his long train appears more like a dandy than a
warrior, but he sometimes engages in fierce contests: the Rev. W. Darwin
Fox informs me that two peacocks became so excited whilst fighting at
some little distance from Chester that they flew over the whole city,
still fighting, until they alighted on the top of St. John’s tower.
The spur, in those gallinaceous birds which are thus provided, is
generally single; but Polyplectron (see fig. 51, p. 90) has two or more
on each leg; and one of the Blood-pheasants (_Ithaginis cruentus_) has
been seen with five spurs. The spurs are generally confined to the male,
being represented by mere knobs or rudiments in the female; but the
females of the Java peacock (_Pavo muticus_) and, as I am informed by
Mr. Blyth, of the small fire-backed pheasant (_Euplocamus
erythropthalmus_) possess spurs. In Galloperdix it is usual for the
males to have two spurs, and for the females to have only one on each
leg.[73] Hence spurs may safely be considered as a masculine character,
though occasionally transferred in a greater or less degree to the
females. Like most other secondary sexual characters, the spurs are
highly variable both in number and development in the same species.
[Illustration: Fig. 38. Palamedea cornuta (from Brehm), shewing the
double-wing-spurs, and the filament on the head.]
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