The Descent of Man, and Selection in Relation to Sex, Том 2J. Murray, 1871 - Всего страниц: 491 |
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Стр. 6
... likewise pointed in both sexes of R. maculata , but only when completely adult ; the males acquiring them at an earlier age than the females . We shall hereafter meet with analogous cases with certain birds , in which the male acquires ...
... likewise pointed in both sexes of R. maculata , but only when completely adult ; the males acquiring them at an earlier age than the females . We shall hereafter meet with analogous cases with certain birds , in which the male acquires ...
Стр. 13
... likewise the case with a multitude of fishes , the sexes of which at all other seasons of the year are identical in colour . The tench , roach , and perch may be given as instances . The male salmon at this season is " marked on the ...
... likewise the case with a multitude of fishes , the sexes of which at all other seasons of the year are identical in colour . The tench , roach , and perch may be given as instances . The male salmon at this season is " marked on the ...
Стр. 14
... likewise at this season rather brighter in colour than the females.21 The colours of the pike ( Esox reticulatus ) of the United States , especially of the male , become , during the breeding - season , exceedingly intense , brilliant ...
... likewise at this season rather brighter in colour than the females.21 The colours of the pike ( Esox reticulatus ) of the United States , especially of the male , become , during the breeding - season , exceedingly intense , brilliant ...
Стр. 20
... likewise with the sticklebacks ( Gasterosteus ) , in which the males become brilliantly coloured during the spawning - season . The male of the smooth - tailed stickleback ( G. leiurus ) per- forms during a long time the duties of a ...
... likewise with the sticklebacks ( Gasterosteus ) , in which the males become brilliantly coloured during the spawning - season . The male of the smooth - tailed stickleback ( G. leiurus ) per- forms during a long time the duties of a ...
Стр. 31
... likewise be endowed with sufficient taste to admire brilliant colours in their partners , so as to lead to the adornment of the species through sexual selection . Nevertheless it is difficult to account in any other manner for the ...
... likewise be endowed with sufficient taste to admire brilliant colours in their partners , so as to lead to the adornment of the species through sexual selection . Nevertheless it is difficult to account in any other manner for the ...
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acquired adult female adult male appear Argus pheasant Audubon Australia beak beard beauty Birds of India Blyth body breed breeding-season Brehm bright colours British Birds canine teeth charm common common pheasant courtship crest curious deer developed differences in colour distinct domestic doubt Edition fact feathers fighting fishes genus Gould Günther habits hair head Hist horns ibid Ibis India Indian bustard inheritance instance Jerdon less likewise lower animals Lubbock Malay Archipelago male birds mammals manner modified moult natural selection nearly nests observed occurs ocelli offspring ornaments pair peacock plumage plumes Polyplectron Portrait possess Post 8vo probable Proc progenitors Quadrumana quadrupeds races racters remarks sake of protection savages season sexes sexual selection shew shewn species spots stripes tail tail-coverts tail-feathers teeth tints tion transmission transmitted tribe tusks upper various vocal organs whilst the females wild turkey wing-feathers wings women young Zoolog