Part of my usual morning routine is to chase the pigeons away from my balcony. Yes, it's futile, because they usually return in a minute or two. Ohwell. Anyway, over the last few days I noticed there were more pigeons than usual hanging around here, and they would return faster after I chased them away. Plus, there was almost always one sitting in the flower planter on the ground. Upon closer inspection this morning, I noticed two eggs in there. No wonder the pigeon was always in a rush to come back.
More pictures and commentary over here.