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
Most of the British Buntings are plain-coloured birds; but in the spring
the feathers on the head of the male reed-bunting (_Emberiza
schœniculus_) acquire a fine black colour by the abrasion of the
dusky tips; and these are erected during the act of courtship. Mr. Weir
has kept two species of Amadina from Australia: the _A. castanotis_ is a
very small and chastely-coloured finch, with a dark tail, white rump,
and jet-black upper tail-coverts, each of the latter being marked with
three large conspicuous oval spots of white.[144] This species, when
courting the female, slightly spreads out and vibrates these
parti-coloured tail-coverts in a very peculiar manner. The male _Amadina
Lathami_ behaves very differently, exhibiting before the female his
brilliantly-spotted breast and scarlet rump and scarlet upper
tail-coverts. I may here add from Dr. Jerdon, that the Indian Bulbul
(_Pycnonotus hæmorrhous_) has crimson _under_ tail-coverts, and the
beauty of these feathers, it might be thought, could never be well
exhibited; but the bird “when excited often spreads them out laterally,
so that they can be seen even from above.”[145] The common pigeon has
iridescent feathers on the breast, and every one must have seen how the
male inflates his breast whilst courting the female, thus showing off
these feathers to the best advantage. One of the beautiful bronze-winged
pigeons of Australia (_Ocyphaps lophotes_) behaves, as described to me
by Mr. Weir, very differently: the male, whilst standing before the
female, lowers his head almost to the ground, spreads out and raises
perpendicularly his tail, and half expands his wings. He then
alternately and slowly raises and depresses his body, so that the
iridescent metallic feathers are all seen at once, and glitter in the
sun.
Sufficient facts have now been given to shew with what care male birds
display their various charms, and this they do with the utmost skill.
Whilst preening their feathers, they have frequent opportunities for
admiring themselves and of studying how best to exhibit their beauty.
But as all the males of the same species display themselves in exactly
the same manner, it appears that actions, at first perhaps intentional,
have become instinctive. If so, we ought not to accuse birds of
conscious vanity; yet when we see a peacock strutting about, with
expanded and quivering tail-feathers, he seems the very emblem of pride
and vanity.
Public-domain text, read in full here on John Shaqi.
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