When our friend Lawrence Cutts showed this to us, he remarked, "why didn't I think of this?" Rightfully so, as this is the most innovative item we have seen in years. You put the screen on your hive at any time of the day. Returning bees go up the screen and enter through the holes. The bees in the hive can't get out so you can catch the field force whenever you want and move whenever you want.