In Chilau, he relates, that he has seen such massive flights of these birds winging their way to their roosting-places among the cocoa-nut trees that overshadow the market-place, that their cries completely drowned the Babel-like confusion of tongues heard among the buyers and sellers in the streets. He had previously been told of the flocks which thus pay their nightly visits, and placed himself, accordingly, towards evening, upon one of the neighbouring bridges, in order to form a calculation of the numbers that might make their appearance in a certain given direction. At about four o'clock in the afternoon they began to arrive; scattered swarms were seen wending their way homewards, to these there succeeded others still more numerous, and in the course of half an hour the homeward stream was apparently in full flow. He very soon found that it was impossible even to count the flocks, which seemed gradually to unite into one great living, roaring torrent. Some flew high in the air, until they were immediately over their roosting-place, and then suddenly plunged down, wheeling round and round towards the tree-tops, of which they were in search. Others crowded onwards, flying close to the ground--indeed, so closely that some of them nearly grazed his face. They swept along with the rapidity of thought, and their dazzling plumage seemed to be lit up with gorgeous brilliancy, as it glanced in the rays of the sun. He waited at his post of observation until the evening closed in, and he could see no longer, but even then the flight of the birds as they made towards their nests was audible. When he fired off a gun, they rose with a sound like that of a furiously rushing wind; soon, however, they again settled down, and commenced an indescribable hubbub. The shrill screams of the birds, the noise caused by the fluttering of their wings, and the rattling of the leaves of the palm-trees was so deafening, that he was heartily glad when he escaped from such a turmoil, and took refuge in his own house. [Illustration: COCKATOOS (_Cacatua_).] Next to a safe sleeping-place, the presence of trees thickly crowned with foliage is an essential requisite for the comfortable lodgment of parrots; this they require, not so much as a protection against the weather, as for a secure hiding-place. Of all things they like warmth, nevertheless they do not absolutely avoid a cool temperature, and still less are they afraid of wet, at least for a time. [Illustration: COLLARED PARROT (_Palæornis torquatus_).]