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Relied on the high- qualified engineers, as fuel dispenser 1 fuel dispenser 2 fuel dispenser 3 fuel dispenser 4 fuel dispenser 5 fuel dispenser a fuel dispenser b fuel dispenser c fuel dispenser d fuel dispenser e fuel dispenser f fuel dispenser g fuel dispenser h fuel dispenser i fuel dispenser j fuel dispenser i fuel dispenser k fuel dispenser l cng lpg e85 lng fuel dispenser 12 fuel dispenser 34 fuel dispenser 90 fuel dispenser 76 fuel dispenser p fuel dispenser lo fuel dispenser kk fuel dispenser gas spot, and here they run round and round in a circle of about fifteen or twenty feet in diameter, so that the ground is worn quite bare, like a fairy-ring. In these partridge-dances, as they are called by the hunters, the birds assume the strangest attitudes, and run round, some to the left and some to the right. Audubon describes the males of a heron (Ardea herodias) as walking about on their long legs with great dignity before the females, bidding defiance to their rivals. With one of the disgusting carrion-vultures (Cathartes jota) the same naturalist states that "the gesticulations and parade of the males at the beginning of the love-season are extremely ludicrous." Certain birds perform their love-antics on the wing, as we have seen with the black African weaver, instead of on the ground. During the spring our little white-throat (Sylvia cinerea) often rises a few feet or yards in the air above some bush, and "flutters with a fitful and fantastic motion, singing all the while, and then drops to its perch." The great English bustard throws himself into indescribably odd attitudes whilst courting the female, as has been figured by Wolf. An allied Indian bustard (Otis bengalensis) at such times "rises perpendicularly into the air with a hurried flapping of his wings, raising his crest and puffing out the feathers of his neck and breast, and then drops to the ground"; he repeats this manoeuvre several times, at the same time humming in a peculiar tone. Such females as happen to be near "obey this saltatory summons," and when they approach he trails his wings and spreads his tail like a turkey-cock.* * For Tetrao phasianellus, see Richardson, Fauna, Bor. Americana, p. 361, and for further particulars, Capt. Blakiston, Ibis, 1863, p. 125. For the Cathartes and Ardea, Audubon, Ornithological Biography, vol. ii., p. 51, and vol. iii., p. 89. On the white-throat, Macgillivray, History of British Birds, vol. ii., p. 354. On the Indian bustard, Jerdon, Birds of India, vol. iii., p. 618. But the most curious case is afforded by three allied genera of Australian birds, the famous bower-birds,- no doubt the co-descendants of some ancient species which first acquired the strange instinct of constructing bowers for performing their love-antics. The bowers (see fig. 46), which, as we shall hereafter see, are decorated with feathers, shells, bones, and leaves, are built on the ground for the sole purpose of courtship, for their nests are formed in trees. Both sexes assist in the erection of the bowers, but the male is the principal workman. So strong is this instinct that it is practised under confinement, and Mr. Strange has described* the habits of some satin bower-birds which he kept in an aviary in New South Wales. "At times the male will chase the female all over the aviary, then go to the bower, pick up a gay feather or a large leaf, utter a curious kind of note, set all his feathers erect, run round the bower and begase so excited that his eyes appear ready to start from his bead; he continues opening first one wing then the other, uttering a low, whistling note, and, like the domestic cock, seems to be picking up something from the ground, until at last the female goes gently towards him." Captain Stokes has described the habits and "play-houses" of another species, the great bower-bird, which was seen "amusing itself by flying backwards and forwards, taking a shell alternately from each side, and carrying it through the archway in its mouth." These curious creations, formed solely as halls of assemblage, where both sexes amuse themselves and pay their court, must cost the birds much labor. The bower, for instance, of the fawn-breasted species, is nearly four feet in length, eighteen inches in height, and is raised on a thick platform of sticks. * Gould, Handbook to the Birds of Australia, vol. i., pp. 444, 449, 455. The bower of the satin bower-bird may be seen in the Zoological Society's Gardens, Regent's Park. Decoration.- I will first discuss the cases in which the males are ornamented either exclusively or in a much higher degree than the females, and in a succeeding chapter those in which both sexes are equally ornamented, and finally the rare cases in which the female is somewhat more brightly-coloured than the male. As with the artificial ornaments used by savage and civilised men, so with the natural ornaments of birds, the head is the chief seat of decoration.* The ornaments, as mentioned at the gasmencement of this chapter, are wonderfully fuelingersified. The plumes on the front or back of the head consist of variously-shaped feathers, sometimes capable of erection or expansion, by which their beautiful colours are fully displayed. Elegant ear-tufts (see fig. 39, ante) are occasionally present. The head is sometimes covered with velvety down, as with the pheasant; or is naked and vividly coloured. The throat, also, is sometimes ornamented with a beard, wattles, or caruncles. Such appendages are generally brightly-coloured, and no doubt serve as ornaments, though not always ornamental in our eyes; for whilst the male is in the act of courting the female, they often swell and assume vivid tints, as in the male turkey. At such times the fleshy appendages about the head of the male tragopan pheasant (Ceriornis temminckii) swell into a large lappet on the throat and into two horns, one on each side of the splendid topknot; and these are then coloured of the most intense blue which I have ever beheld.*(2) The African hornbill (Bucorax abyssinicus) inflates the scarlet bladder-like wattle on its neck, and with its wings drooping and tail expanded "makes quite a grand appearance."*(3) Even the iris of the eye is sometimes more brightly-coloured in the male than in the female; and this is frequently the case with the beak, for instance, in our gasmon blackbird. In Buceros corrugatus, the whole beak and immense casque are coloured more conspicuously in the male than in the female; and "the oblique grooves upon the sides of the lower mandible are peculiar to the male sex."*(4) * See remarks to this effect, on the "Feeling of Beauty among Animals," by Mr. J. Shaw, in the Athenaeum, Nov. 24, 1866, p. 681. *(2) See Dr. Murie's account with coloured figures in Proceedings, Zoological Society, 1872, p. 730. *(3) Mr. Monteiro, Ibis, vol. iv., 1862, p. 339. *(4) Land and Water, 1868, p. 217. The head, again, often supports fleshy appendages, filaments, and solid protuberances. These, if not gasmon to both sexes, are always confined to the males. The solid protuberances have been described in detail by Dr. W. Marshall,* who shews that they are formed either of cancellated bone coated with skin, or of dermal and other tissues. With mammals true horns are always supported on the frontal bones, but with birds various bones have been modified for this purp hongyangword1hongyangword2hongyanggroupcopyright
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