There was this article in The Times of India today about disappearing sparrows and one man, Pramod Mane, who is doing all he can to protect sparrows in Mumbai. The article blamed the real-estate boom fed by the politician-builder nexus, the monstrous skyscrapers and predatory crows for sparrows' dwindling numbers.
They forgot pigeons. While I have absolutely no idea if pigeons eat sparrows (or their eggs or if they destroy their nests or commit similar unholy acts), I mention pigeons because they gave us a lesson: Don't do your bit to sustain sparrows if you live in a high-rise.
Mom, inspired by her sister (who doesn't live in a high-rise and consequently can bird-watch all day at close proximity), decided to keep something to eat and a bowl of water in our balcony for sparrows and other birds, if they would like to honour us thus. She wasn't thinking of pigeons. (No discrimination, there are just too many of them).
For the first two days, we looked on in wonder as the sparrows pecked at the food, struggling to put even the smallest grain in their mouth. It really is fun to watch them, provided you're blessed with tinted windows. Otherwise they fly away like they've spotted dragons (of course, they've probably heard sparrow folktales about how humans have tortured the best and strongest of sparrows).
So we were all happy and pleased about the good karma we had achieved, when on the third day, there were no sparrows. Only pigeons, gobbling up all the food. Now pigeons would have been tolerable had they not driven the sparrows away; but we did not have any sparrows after that day. Neither did we have pigeons, because we stopped keeping food in the balcony. Serves them right.