In Vedic literature the Crane is used as an example of a devious man. A Crane stands very still in the water appearing uninterested in his surroundings, but all the while he is waiting and watching for his prey and when he is ready he will suddenly strike. In the same a way a devious enemy may appear like a friend but he is watching for your weaknesses and when he is ready will strike you. You should avoid such Crane-like astrologers.