Read to me :
A legend has it that if the six ravens at the Tower of London is to fly away, the Tower’s walls will collapse. Therefore, the ravens are fed and preened constantly. Crows, their intimate relatives, are not rather gladly received. Peasants have put up crosses in their farms for ages to keep away the ill spirits that were believed to be stood for by crows. For additional security, cloth was hung over the crosses so that the cloth would wave rapidly amidst moving air and unsettle the birds. The crosses adopted the human shape as scarecrow in the end. On the other hand, the birds can bring you good luck. If you notice one flying, your wish will be granted, provided that the crow does not flutter its wings before it disappears from your view. If it really goes out of view, your wish might still be fulfilled if you close your eyes. If the bird is no longer in view when you open your eyes, your wish will be granted.