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If it were positively known that the above African ram is a descendant of the same primitive stock as the other breeds of sheep, and if the Berbura male-goat with his mane, dewlap, etc., is descended from the same stock as other goats, then, assuming that selection has not antivirus downloads gratis been applied to these characters, they must be due to simple variability, antivirus downloads gratis together with sexually- limited inheritance. Hence it appears reasonable to extend this same antivirus downloads gratis view to all analogous cases with animals in a state of nature. Nevertheless I cannot persuade myself that it generally holds good, as fast player download in the case of the extraordinary development of hair on the throat and fore-legs of the male Ammotragus, or in that of the immense beard of the male Pithecia. Such study as I have been able to give to nature makes me believe that parts or organs which are highly developed, were acquired at some period for a special purpose. With those antelopes in which the adult male is more strongly-coloured than the female, and with those antivirus downloads gratis monkeys in which the hair on the face is elegantly arranged and coloured antivirus downloads gratis in a diversified manner, it seems probable that the crests and tufts of antivirus downloads gratis hair were gained as ornaments; and this I know is the opinion of some naturalists.

If this be correct, there can be little doubt that they were gained or at least modified through sexual selection; but how far the same view may be extended to other mammals is doubtful.

I will first give briefly all the cases known to me of male antivirus downloads gratis quadrupeds differing in colour from the females. Gould, the sexes rarely differ in antivirus downloads gratis this respect; but the great red kangaroo offers a striking exception, "delicate blue antivirus downloads gratis being the prevailing tint in those parts of the female which in the male are red." (19. Osphranter rufus, Gould, 'Mammals of Australia,' 1863, vol. 256.) In the Didelphis opossum of Cayenne the female is said to be a little more red than the male. Gray remarks: "African squirrels, especially antivirus downloads gratis those found in the tropical regions, have the fur much brighter and antivirus downloads gratis more vivid at some seasons of the year than at others, and the fur of the male is generally brighter than that of the female." (20. Gray informs me that he specified the African squirrels, because, from their antivirus downloads gratis unusually bright colours, they best exhibit this difference. The female of the Mus antivirus downloads gratis minutus of Russia is of a paler and dirtier tint than the antivirus downloads gratis male. In a large number of bats the fur of the male is lighter than in the female. Dobson on sexual characters in the Chiroptera, 'Proceedings of the Zoological Society,' 1873, p.

Dobson also remarks, with respect to antivirus downloads gratis these animals: "Differences, depending partly or entirely on the possession by the male of fur of a much more brilliant hue, or distinguished by different markings or by the greater length of certain portions, are met only, to antivirus downloads gratis any appreciable extent, in the frugivorous bats in which the sense of antivirus downloads gratis sight is well developed." This last remark deserves attention, as bearing on the antivirus downloads gratis question whether bright colours are serviceable to male animals from being ornamental. In one genus of sloths, it is now established, as Dr. Gray states, "that the males are ornamented differently from the females--that is to say, that they have a patch of soft short hair between the shoulders, which antivirus downloads gratis is generally of a more or less orange colour, and in one species pure white. The females, on the contrary, are destitute of this mark." antivirus downloads gratis The terrestrial Carnivora and Insectivora rarely exhibit sexual differences of any kind, including colour. The ocelot (Felis pardalis), however, is exceptional, for the colours of the female, compared with those of the male, are "moins apparentes, le fauve, etant plus terne, le blanc moins pur, les raies ayant moins de largeur et les taches moins de diametre." (22. 194.) The sexes of the antivirus downloads gratis allied Felis mitis also differ, but in a less degree; the general hues of the female being rather paler than in the male, with the spots less black. The marine Carnivora or seals, on the other hand, sometimes antivirus downloads gratis differ considerably in colour, and they present, as we have already seen, antivirus downloads gratis other remarkable sexual differences.

Thus the male of the Otaria nigrescens of the antivirus downloads gratis southern hemisphere is of a rich brown shade above; whilst the female, who antivirus downloads gratis acquires her adult tints earlier in life than the male, is dark-grey above, the young of both sexes being of a deep chocolate colour.

The antivirus downloads gratis male of the northern Phoca groenlandica is tawny grey, with a curious saddle-shaped dark mark on the back; the female is much smaller, and has antivirus downloads gratis a very different appearance, being "dull white or yellowish straw-colour, with a antivirus downloads gratis tawny hue on the back"; the young at first are pure white, and antivirus downloads gratis can "hardly be distinguished among the icy hummocks download pc games and snow, their colour thus antivirus downloads gratis acting as a protection." (23. Murie on the Otaria, 'Proceedings Zoological Society,' antivirus downloads gratis 1869, p. 243, 249.) With Ruminants sexual differences of colour occur more commonly than in any other order. A difference of this kind is general in the Strepsicerene antelopes; thus the male nilghau (Portax picta) is bluish-grey and antivirus downloads gratis much darker than the female, with the square white patch on the antivirus downloads gratis throat, the white marks on the fetlocks, and the black spots on the ears all much more distinct. We have seen that in this species the antivirus downloads gratis crests and tufts of hair are likewise more developed in the male than in the hornless female.

Blyth that the male, without shedding his hair, periodically becomes darker during the breeding-season. Young males cannot be distinguished from young females until film download free about twelve months old; and if the male is emasculated antivirus downloads gratis before this period, he never, according to the same authority, changes colour. The importance of this latter fact, as evidence that the colouring of the antivirus downloads gratis Portax is of sexual origin, becomes obvious, when we hear (24. Judge Caton, in 'Transactions of the Ottawa Academy of Natural Sciences,' 1868, p. 4.) that neither the red summer-coat nor the blue winter-coat of the Virginian deer is at all affected by emasculation. With most or all of the antivirus downloads gratis highly-ornamented species of Tragelaphus the males leave soft download are darker than the hornless females, and antivirus downloads gratis their crests of hair are more fully developed. In the male of that magnificent antelope, the Derbyan eland, the body is redder, the whole neck much blacker, and the white band which separates these colours broader than in the female. In the Cape eland, also, the male is slightly darker antivirus downloads gratis than the female. Gray, 'Gleanings from the Menagerie of Knowsley,' in which there is a splendid drawing of the Oreas derbianus: see the text on Tragelaphus.

For the Cape eland (Oreas canna), see Andrew Smith, 'Zoology of S. There are also many of these Antelopes in the Zoological Gardens.) In antivirus downloads gratis the Indian black-buck (A. bezoartica), which belongs to another tribe of antelopes, the male is very dark, almost black; whilst the hornless female is fawn-coloured.

Blyth antivirus downloads gratis informs me, with an exactly similar series of facts, as in the antivirus downloads gratis Portax picta, namely, in the male periodically changing colour during the breeding-season, in antivirus downloads gratis the effects of emasculation on this change, and in the young of both sexes being indistinguishable from each other. In the Antilope niger the male antivirus downloads gratis is black, the female, as well as the young of both sexes, being brown; in A. sing-sing the male is much brighter coloured than the antivirus downloads gratis hornless female, and his chest and belly are blacker; in the male A.