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Updated: June 28, 2025
Ostrich, African, sexes and incubation of the. Ostriches, stripes of young. Otaria jubata, mane of the male. Otaria nigrescens, difference in the coloration of the sexes of. Otis bengalensis, love-antics of the male. Otis tarda, throat-pouch of the male; polygamous. Ouzel, ring-, colours and nidification of the. Ouzel, water-, singing in the autumn; colours and nidification of the.
Prussia, numerical proportion of male and female births in. Psocus, proportions of the sexes in. Ptarmigan, monogamous; summer and winter plumage of the; nuptial assemblages of; triple moult of the; protective coloration of. Puff-birds, colours and nidification of the. Pugnacity of fine-plumaged male birds. Pumas, stripes of young. Puppies learning from cats to clean their faces.
Notwithstanding the foregoing objections, I cannot doubt, after reading Mr. Mr. Mr. Wallace believes that in these groups, as the males gradually acquired through sexual selection their brilliant colours, these were transferred to the females and were not eliminated by natural selection, owing to the protection which they already enjoyed from their manner of nidification.
The eggs are laid from four days to a week apart, instead of daily, as with most birds, their period of perilous nidification on that haphazard apology of a nest being thus possibly prolonged to six weeks.
But if, somewhere in that vast hall, there were a few preparations, exemplifying the leading structural peculiarities and the mode of development of a common fowl; if the types of the genera, the leading modifications in the skeleton, in the plumage at various ages, in the mode of nidification, and the like, among birds, were displayed; and if the other specimens were put away in a place where the men of science, to whom they are alone useful, could have free access to them, I can conceive that this collection might become a great instrument of scientific education.
The mode of nidification is unknown; but the natives told me that the nest was formed of leaves placed on an ant's nest, or on some projecting limb of a very lofty tree, and they believe that it contains only one young bird. The egg is quite unknown, and the natives declared they had never seen it; and a very high reward offered for one by a Dutch official did not meet with success.
As far as it can be trusted, the conclusion is interesting, that sexual selection together with equal or nearly equal inheritance by both sexes, have indirectly determined the manner of nidification of whole groups of birds. According to Mr.
Honey-buzzard of India, variation in the crest of. Honey-sucker, females and young of. Honey-suckers, moulting of the; Australian, nidification of. Honour, law of. Hooker, Dr., forbearance of elephant to his keeper; on the colour of the beard in man. Hookham, Mr., on mental concepts in animals. Hoolock Gibbon, nose of. Hoopoe, sounds produced by male. Hoplopterus armatus, wing-spurs of.
Greyhounds, numerical proportion of the sexes in; numerical proportion of male and female births in. Grouse, red, monogamous; pugnacity of young male; producing a sound by beating their wings together; duration of courtship of; colours and nidification of.
In its general manner of feeding, of quickly hopping out of the thickets and back again, in its desire of concealment, unwillingness to take flight, and nidification, it bears a close resemblance to the Turco; but its appearance is not quite so ridiculous.
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