Cranes are inhabitants of morasses and plains, being especially fond of the neighbourhood of lagoons, tanks, and fields of corn or rice; yet they are also found in boggy openings in forests, on sandy flats, or even on the sea-shore. They are gregarious after the breeding season, when they often collect into flocks of immense size, which pass the night together and traverse vast distances in company. The northern species all migrate southwards in winter. Erect and tall, they may be seen striding swiftly along with head thrown back, or strutting around their mates; while in spring they often stand in rows and proceed to stalk about in single file, or dance to meet one another with nodding heads, necks advanced, and wings widely outspread. Thereafter they bow towards the ground, jump in the air, and perform graceful antics of all descriptions. The chosen spot for these dances is commonly near water. The male courts his spouse in somewhat similar fashion, and twigs or feathers are often tossed in the air in sport, to be caught again ere they touch the ground. Rising from a level spot appears to be a difficult matter, the birds running awkwardly for a few yards, and labouring heavily with their wings to gain their purpose; when once in the air, however, the flight is steady and swift, with head {253}and legs outstretched, though this is varied by countless elegant evolutions and gyrations, as they rise higher and higher until they become mere specks in the heavens, and finally disappear from sight. The characteristic utterance is a harsh guttural or resonant trumpeting sound, uttered on the ground with the head thrown back and the bill open, or repeated incessantly at great elevations; but the Whooping Crane has a clear, piercing cry, the Asiatic White Crane a feeble but mellow whistle, and the Crowned Cranes a plaintive but fairly sonorous set of notes. The varying calibre of the voice has been thought to be connected with the convolutions of the trachea mentioned above, the young giving vent to a weak pipe or trill. Virgil's lines concerning the noise made before rain, and the flight, are well-known to Latin scholars. The food consists of grain, pulse, acorns, shoots, flowers, roots, tubers, bulbs, and the like, with the occasional addition of small mammals and birds, reptiles, amphibians, worms, insects, and even fish; the members of this Family, however, dislike wading, and only swim under compulsion. Feeding chiefly in the morning and evening, when they post sentinels, as Rooks do, they often stand or doze upon one leg, with the head drawn back upon the shoulders. Cranes, which are said to pair for life, return to the same breeding haunts annually, where they either construct a large fabric of reeds, rushes, and aquatic herbage, or use straw and small twigs for their nest. The conical pile, with its moderate depression on the top, is commonly placed in shallows, fresh materials being added if the water rises. Several species,