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Bishop, in 'Todd's Cyclopaedia of Anatomy and Physiology,' vol.

1496.), though they never sing, and free download web browser do not naturally modulate their voices to any great free download web browser extent. As stated by Barrington in 'Philosophical Transactions,' 1773, p. 262.) that with the true songsters the muscles of the larynx are stronger in the males than in the females; but with this slight exception free download web browser there is no difference in the vocal organs of the two sexes, although the males of most species free download web browser sing so much better and more continuously than the free download web browser females.

It is remarkable that only small birds free download web browser properly sing. The Australian genus Menura, however, must be excepted; for the Menura Alberti, which is about the free download web browser size of a half-grown turkey, not only mocks other birds, but "its own whistle is exceedingly beautiful and varied." The males congregate and form "corroborying places," free download web browser where they sing, raising and spreading their tails like peacocks, and drooping their wings. 125.) It is also free download web browser remarkable that birds which sing well are rarely decorated with brilliant colours or other ornaments. Of our British birds, excepting the bullfinch and goldfinch, the best songsters are plain-coloured. The kingfisher, bee-eater, roller, hoopoe, woodpeckers, etc., utter harsh cries; and the brilliant birds of free download web browser the tropics are hardly ever songsters. See remarks to this effect in Gould's 'Introduction to the Trochilidae,' 1861, p. 22.) Hence bright colours and the power of song seem to replace each other. We free download web browser can perceive that if the plumage did not vary in brightness, or if bright colours were dangerous to the species, other means would be employed to charm free download web browser the females; and melody of voice offers one such means. Wood.)] In some birds the vocal organs differ greatly in the two sexes.

39) the free download web browser male has two bare, orange-coloured sacks, one on each free download web browser side of the neck; and these are largely inflated when the male, during the breeding-season, makes his curious hollow sound, audible at a great distance.

Audubon proved that the sound was intimately connected with this apparatus (which reminds us of the air-sacks on each side of the mouth of certain male frogs), for free download web browser he found that the sound was much diminished when one of the sacks of a tame bird was free download web browser pricked, and when both were pricked it was altogether stopped. The female has "a somewhat similar, though smaller naked space of skin on the neck; but this is not capable of inflation." (41.

'The Sportsman and Naturalist in Canada,' by Major W.

116) an excellent account of the attitude and habits free download web browser of this bird during its courtship. He states that the ear-tufts or neck-plumes are erected, so that they meet over the crown of the head. 39.) The free download web browser male of another kind of grouse (Tetrao urophasianus), whilst courting the female, has his "bare yellow oesophagus inflated to a prodigious size, fully half as large as the body"; and he then utters various grating, free download web browser deep, hollow tones. With his neck-feathers erect, his wings lowered, and buzzing on the ground, and his long pointed tail download utorrent spread out like a fan, he displays a variety of grotesque attitudes. The oesophagus of the female is not in any way remarkable. The free download web browser Umbrella-bird or Cephalopterus ornatus, male (from Brehm).] It seems now free pdf download well made out that the great throat free download web browser free download antivirus download pouch of the European male bustard (Otis tarda), and of at least four other species, does not, as was formerly supposed, serve to hold water, but is connected with the utterance during the breeding-season of a peculiar sound resembling "oak." (43. The following papers have been lately written on this subject: Prof. In this latter paper an excellent figure is given of the male Australian Bustard in full display with the sack distended. It is a singular fact that the sack is not developed in all the males of the same species.) A crow-like bird inhabiting South America (see Cephalopterus ornatus, Fig.

40) is called free download web browser the umbrella-bird, from its immense top knot, formed of bare white quills surmounted by dark-blue plumes, which it can elevate into a great dome no less than five inches in diameter, covering the whole head. This bird has on its neck a long, thin, cylindrical fleshy appendage, which is thickly clothed with scale-like blue feathers.

It probably serves in part as an ornament, but likewise as a resounding apparatus; for Mr. Bates found that it is connected "with an unusual free download web browser development of the trachea and vocal organs." It is dilated when the bird utters its singularly deep, loud and long sustained fluty note. The head- crest and neck-appendage are rudimentary in msn live download the female.

284; Wallace, in 'Proceedings, Zoological Society,' 1850, p. A new species, with a still larger neck-appendage (C. penduliger), has lately been discovered, see 'Ibis,' vol. 457.) The vocal free download web browser organs of various web-footed and wading birds are extraordinarily complex, and differ to a certain extent in the two sexes. In some cases the trachea is convoluted, free download web browser like a French horn, and is deeply embedded in the sternum. In windows flash download the wild swan (Cygnus ferus) it is more deeply embedded in the adult male than in the adult female or young male. In the male Merganser the enlarged portion of the trachea is furnished with an additional pair of muscles. Bishop, in Todd's 'Cyclopaedia of Anatomy and Physiology,' download gimp vol.