Rajarshi Ray - FE block, Salt lake FE Block, Salt Lake City Kolkata West Bengal

When I was a school going kid, say some 12-15 years back, I could see so many house sparrows in and around my house. I remember it was so common for the house sparrows to make nest inside our house. The birds used to enter our house fearless and eat bread crumbs and other food stuff from the dining table.
Unfortunately, i do not see birds entering our house anymore and making nests. Infact, the number of sparrows I observe around my locality has reduced. Increased pollution levels in air, sound, water and soil seems to be the reason to me.