Drone Congregation Area (DCA) has always been reported as, some distance, if not, miles away from the apiary and high in the air. The DCA reportedly is where BCWW took place. Over the years I've found dead drones right on the landing board with the junk pulled out, assuming the mate queen just hauled the now dead drone back to the hive with her. That would make for a very large and easy target for bird or dragonfly, so my thought were that the DCA is not always miles away, but closer. But, I had no proof!