Stop! Thief!
After talking about it for a looooong time, we finally got plants out on the balcony last summer. We didn't go too fancy - just some sort of woven grass like enclosure in a metal frame that hangs off of the railing. Since they've been out there, we've managed to kill most of the plants that filled the boxes - with the exception of the parsely that's grown like it's on steroids.
Well, a few weeks ago I noticed that the condo-side of one of the planters seemed to be falling apart. At first I thought it was our fault for not taking better care of the plants. Maybe one had grown too much and the roots were pushing it out. Or maybe the planter was defective. Now I know the truth! It seems that Spring has sprung and there's a new family of birds in the area building a nest. A nest built with material from our planter. Oh well, could be worse - it could have been a bee hive or wasp nest that went up by our place