The Wading-birds have long bare legs because they live in marshy places, and long necks and beaks to catch the small animals upon which they feed. Snipe and Woodcock have long tapering bills which are alive to the very points with what are called nerves, so that they may be able to feel for worms as they dig for them in the soft sand and mud, where they cannot see them. Two birds of this family, the Stork and the Crane, are mentioned in the Bible in connection with a wonderful power which God has given to some birds, by means of which they know when the time is come for them to leave a country where their food is over and gone, and where the winter is too cold for them, for a warmer land, where they may find food convenient for them, and from which they will know right well how to come back again when spring returns, with its food and foliage. Such birds are called birds of passage; the Swallow is the one you know best, and it also is mentioned in the verse in which so many migratory birds are grouped together, "The stork in the heaven knoweth her appointed times; and the turtle and the crane and the swallow observe the time of their coming." It is God who bids these birds "observe the time of their coming": no one knows why they go south for the winter, nor how they can tell their way over land and sea, and come back again to the very place from whence they took their flight. The Stork must be to the People in Palestine just such a "guest of summer" as the swallow is with us, for it regularly arrives about the end of March, and flies away in the autumn. Ships make their long voyages to the other end of the world and back with wonderful regularity, but though the helmsman has a compass to guide him, they do not arrive in port so exactly at their appointed time as the little swallow, who has only the sense which we call "instinct" to guide it; only its own light, strong wings to carry it on its swift way, flying a mile a minute--for even to its little bones and feathers, every part of its body is filled with air, rendering it the most buoyant of winged creatures. I met with a beautiful passage about migratory birds in a book I was reading lately. The writer says, "Were they planets revolving round the sun, their arrival could hardly be more accurately calculated by the astronomer.... The little birds are guided in their flight through the waste, lone wilderness of the sky, and over wide seas, without a compass or a map or a path, by His counsel and will. And they obey that guidance without the slightest inclination to swerve from it or seek a way of their own....