The period of incubation begins in the month of November, and presents the best opportunity for shooting the ostrich. At this season, also, the feathers are in the finest condition, though the fat is much less abundant. Five or six sportsmen set out together on horseback, taking with them two camels laden with provisions for a month, besides an abundant supply of powder and ball. They search for places where rain has lately fallen, or where pools of water occur, for in such localities there is likely to be that plentiful herbage which never fails to attract the ostrich. Having discovered its footprints, the sportsmen examine them with care. If they appear only here and there on the bare spots, they indicate that the bird has been here to graze; but if they cross each other in various directions, and the grass is rather trampled down than eaten, the ostrich has certainly made her nest in the neighbourhood, and an active but cautious search for it is commenced. If she is only making her nest, the operation may be detected at a great distance, as it consists simply of pushing out the sand from the centre to the circumference of a circle, so as to form a large hole. The sand rises in dense clouds round the spot, and the bird utters a pining cry all day long. When the nest is finished, she cries only towards three in the afternoon. The female sits on the eggs from morning till noon, while her mate is grazing; at noon, he takes her place, and she goes to the pasture in her turn. When she returns, she places herself facing her mate, and at the distance of five or six paces from the nest, which he occupies all night, in order to defend it from enemies, especially from the jackals, which often lie in ambush, ready to take advantage of an unguarded moment. Hunters often find the carcasses of these animals near ostriches' nests.