Hi, Ibrahim. You can force swarms to self-retrieve by simply putting a queen excluder between the bottom box and the bottom board. Any swarms will be back in the hive within 2 hours after finding they don't have and egg layer with them. If you do this, though, you must go through the hive frame by frame every 10 days to be sure the bees aren't trying to raise new queens. With the QE below, new queens can't get out to mate. Dan __________________________________________________ Do You Yahoo!? Yahoo! Photos - Share your holiday photos online! http://photos.yahoo.com/