Something you may want to be informed about: http://www.straitstimes.com/premium/forum-letters/story/ensure-birds-dont-become-new-problem-20130806
Many years ago, Singapore already had a movement, started by animal-lovers to protect the pigeons. How to protect the pigeons? Do not feed them.
Why?
I published this in March 2010: http://animalcare.my/2010/03/13/save-the-pigeons/