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In August and September the white storks leave the nesting areas in Europe and fly south towards Africa. There they spend the winter in the savannahs from Kenya and Uganda to the south to the province of Cape in South Africa. In these zones they congregate in great flocks that can exceed thousand birds. Some diverge to the west, to the west of Sudan and Chad, and even to Nigeria. In the spring the birds return to the north, passing through Sudan and Egypt between February and April. They arrive in Europe around the end of March and April, after a journey lasting an average of 49 days. By comparison, the fall trip is completed in about 26 days. The presence of tailwinds and the shortage of food and water along the route – ships tend to fly faster in regions with no resources – increase the average speed of travel.
