When the wild ducks pass in the migrating season, they cause strange tides to rise in the lands beneath them. As if magnetized by the great triangular flock, the farmyard ducks try clumsily to leave the ground. The call of the wild has awakened some vestige of the wild within them, and for a moment they have turned into birds of passage. In those hard little heads normally filled with simple images of the pond, of worms and of their roosting-house, now stretch the vast continents, the taste of the ocean winds and the shape of the seas. The creature never knew until now that its brain could contain such marvels, and it beats its wings in contempt for seed and worms, trying to become a wild duck.