黄果漫剧流畅快不快This organ is as long as the body, and flattened above and below; when extended, the further half is turned over so as to place its lower side uppermost, and the animal has it in its power to roll it up into a spire, commencing from above downwards, to the very base.The Pelican affords an excellent illustration of the fifth and last Order of Birds, the Swimmers; the essential character of which consists in the membranous union of the toes, which renders them what is usually termed web-footed, and enables them to propel themselves upon the surface of the water with greater or less rapidity in proportion to the greater or less comparative extent of the membrane in which their toes are enveloped. They are all consequently inhabitants of marshy situations, of the banks of rivers and lakes, or of the seacoast; and most of them seek their subsistence in their most congenial element, the water, notwithstanding that by far[228] the greater number of them are also endowed with very considerable powers of flight.