In one of the world’s most populated cities, two brothers — Nadeem and Saud — devote their lives to the quixotic effort of protecting the black kite, a majestic bird of prey essential to the ecosystem of New Delhi that has been falling from the sky at alarming rates. Amid environmental toxicity and social unrest, the ‘kite brothers’ spend day and night caring for the creatures in their makeshift avian basement hospital. Director Shaunak Sen (Cities of Sleep) explores…