Lazuli Kundu - residental colony Girish Avenue Kolkata West Bengal

Once I was on my way on Girish Avenue(Kolkata).While I was passing through the street,I heard the sound of chirping from a tree.I can't see anyone because the time is in evening.But there must be around 10 sparrows in that tree.

I am from kolkata("Nandannagar Market" , Tarun tirtha Club Belgharia West Bengal).I never ever see baby sparrows(male).In 2009-2010 baby sparrows(female)were seen.
But now-a-days I don't see any of the little ones.