One of the greatest treasures of the Hortobágy´s fauna is beyond doubt the water avifauna, which is admired and surveyed by ornithologists worldwide. It is mainly at the time of the birds´ migration in spring and autumn that the wetlands of the national park spring into commotion, wild geese and mallards arrive, but the greatest spectacle is to be provided by the first crane flocks appearing on the horizon with flutelike calls: the autumn migration of the cranes, has begun.