It was the ‘legend’ that the folks of the past advised their successors to learn from the sparrows to be active. However, the metaphorical advice is likely to have taken a different shape in peoples’ minds. People, especially in cities like Chennai, have become so busy (though not active ) that they do not even notice that they have lost their visitor – the house sparrow. But not all. Few are busy looking for our sparrows. The tales they heard about them, the sight that stayed in their memories, the longing to see the sparrows again triggered the seeking. EMAI contributes a great deal of effort to increase the sparrow population. A random population survey conducted by EMAI has revealed that in the past few months, the number of sparrows seems to have increased in certain parts of the city. In particular, North Chennai, parts of Ambattur, Avadi, Perambur, Ayanavaram, Parrys, Choolaimedu, T Nagar, Aminjikarai, Koyambedu, Porur, Thiruvanmiyur, Tambaram, Chromepet and Poonamallee have a relatively decent population of sparrows. Conversely, the sparrows give the impression that they have abandoned the concrete structures, although they are found in sections where huts and thatched roof houses exist.
Check out the link below for more info:
https://www.thehindu.com/thehindu/yw/2003/09/13/stories/2003091301370300.htm
However, a lot more study needs to be done to understand whether the apparent rise in sparrow population is an evidence of their comeback.