User blog comment:Fintin/Doflamingo's Survival and Bird Cage/@comment-76.253.66.209-20140423030134

I beleive Bird cage is an ablity that allows doflamingo to control the population of dressrosa sepratly, like a puppet master. It would save his shichibukai status, the down side being he would be forced to stay in Dressrosa long enough for suger to wake and Re toyafie the population