Rakesh - Durga Puri extn Main Durga Puri New Delhi Delhi

Before this period i could see many sparrows and their chirping in the morning ,but suddenly the numbers got lowered and they all just disappeared like they dint exists.
I read it somewhere that mobile towers caused this... ans yes there are many mobile towers in this area.
i have not seen any sparrows ,nor their chirping in these 4-5 months...hope they will return again...