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Secondary Sexual Characters of Fishes, Amphibians, and dropbox download Reptiles. Fishes: Courtship and battles of the males--Larger size of the females-- Males, bright colours and ornamental appendages; other strange characters-- Colours and dropbox download appendages acquired by the males during the breeding-season alone--Fishes with both sexes brilliantly coloured--Protective colours--The less conspicuous colours of the female cannot be download dictionary accounted for on the principle of protection--Male fishes building nests, and taking charge of the ova and young. AMPHIBIANS: Differences in dropbox download structure and colour between the sexes--Vocal organs. REPTILES: Chelonians--Crocodiles-- Snakes, colours in some cases protective--Lizards, battles of--Ornamental appendages--Strange differences in structure between the pc software free downloads sexes--Colours-- Sexual differences almost as great as with birds.

Sexual differences--Law of battle--Special weapons--Vocal organs-- Instrumental music--Love-antics and dances--Decorations, permanent and seasonal--Double and single annual moults--Display dropbox download of ornaments by the males. Choice exerted by the dropbox download female--Length of courtship--Unpaired birds--Mental qualities and taste for the beautiful--Preference or antipathy shewn by the female for particular dropbox download males--Variability of birds--Variations sometimes abrupt--Laws of variation--Formation of ocelli--Gradations of character-- Case of Peacock, Argus pheasant, and Urosticte. Discussion as to why dropbox download the males alone of some species, and both sexes of others are brightly coloured--On sexually-limited inheritance, as applied to various structures and to brightly-coloured plumage--Nidification in relation to colour--Loss of nuptial plumage during the winter. The immature plumage in relation to the character of the plumage in both sexes when adult--Six classes of cases--Sexual differences between the males of closely-allied or representative species--The female assuming the characters free youtube downloader of the male--Plumage of the young in relation to the summer and winter plumage dropbox download of the adults--On the increase of beauty in the birds of the world--Protective dropbox download colouring--Conspicuously coloured birds--Novelty appreciated--Summary of dropbox download the four chapters on birds. The law of battle--Special weapons, confined to the dropbox download males--Cause of absence of weapons in the female--Weapons common to both sexes, yet dropbox download primarily acquired by the download free games male--Other uses of such weapons--Their dropbox download high importance-- Greater size of the male--Means of defence--On the preference shewn by either sex in the pairing of quadrupeds. Voice--Remarkable sexual peculiarities in seals--Odour--Development of the hair--Colour of the hair and skin--Anomalous case of the dropbox download female being more ornamented than the male--Colour and ornaments due to sexual selection-- Colour acquired for the sake dropbox download of protection--Colour, though common to both sexes, often due to sexual selection--On the disappearance of spots and stripes in adult quadrupeds--On the colours and ornaments of the Quadrumana--Summary. SEXUAL SELECTION IN RELATION TO MAN, AND CONCLUSION. Differences between man and woman--Causes of such differences, dropbox download and of certain characters common to both sexes--Law of battle--Differences in mental powers, and voice--On the influence of dropbox download beauty in determining the marriages of mankind--Attention paid by savages to ornaments--Their ideas of beauty in women--The tendency to exaggerate each natural peculiarity.