So I just finished the game and enjoyed my mind ****, and I believe I understand the story quite a bit regarding different worlds and whatnot. But what really bugs me is the Songbird. Are we to assume that the tear-hopping is how the Songbird was developed? I mean,it's a giant bird that looks quite a bit like a big-daddy? Im simply wondering where this thing came from. Since you see it basically "die" when it's in Rapture...could it somehow be from Rapture? Perhaps they tear-hopped to Rapture and steal it/the technology? Or is his existance explained elsewhere...?