Balaji T J - Thiruvanmiyur Thendral Flats, 2, Balakrishnan Rd, Valmiki Nagar, CGE Housing Colony, Thiruvanmiyur Chennai Tamil Nadu 600041

This is my apartment where I have recently moved in. I see sparrows in one balcony, I would like to revive them. I feed them with grains, but mostly crows eat them. How can I build a nest for sparrows and feed them safe from other bigger birds?