Two years ago, entrepreneur Ravindra Pal Sood, a resident of Jawahar Nagar in Jaipur, noticed that the incessant chirping of sparrows in his neighbourhood had lessened considerably. He realised that something was amiss, and soon found that the tiny, round, brown bird, once ubiquitous, was fast disappearing. House sparrows, taxonomically classified as Passer domesticus, are intimately associated with human habitation. They nest in man-made structures such as eaves or walls […]