During their migrations, these birds always fly in two lines, which in front meet in an acute angle, thus forming a figure somewhat resembling the Greek letter [Greek: g], which, indeed, is said to have derived its shape from this very circumstance. One of the company always flies in advance of the rest, and thus constitutes the vertex of the angle; and if the movements of the flock are watched, it may readily be observed that when this individual becomes fatigued by being the first to cleave the air, it falls to the rear, and leaves the next in succession to take its post. It has been noticed, moreover, that when the Cranes in their migratory flights meet with a lofty mountain, they utter shrill cries, appear anxious and restless, and fly without any kind of order. Gradually, and each for itself, they now ascend spirally until such time as they have attained sufficient height to pass over the obstacle, when, assuming their original formation, they proceed on their course. At times their flight is so very high that, notwithstanding each individual occupies a considerable space, the birds themselves, though heard in the air, are not perceptible to the naked eye. Their shrill, loud, and trumpet-like note is audible far and near, and if at a short distance is almost deafening. Their voices are rendered more powerful by the peculiar construction of the windpipe, which forms several curvatures in the breast-bone, before descending into and joining the lungs. This tall and stately bird, when it stands upright, reaches to the breast of a man. It is of a shy and wary disposition, and when a large flock alights in a field, either for the purpose of feeding or resting, one or more of the party is always seen standing at some little distance, with head erect, and evidently on the watch. On the approach of danger this individual is the first to take wing, on which the rest follow its example. The nest of the Crane is generally placed among the thick reeds or in the luxuriant herbage of their favourite marshes, but occasionally on the top of some deserted edifice. The eggs are two in number, and have a greenish shell, spotted with brown. Both parents brood, and feed their offspring at first in the nest; the young do not attain their full strength of wing until several months old. THE DEMOISELLE, OR NUMIDIAN CRANE.