Quack! The gander gives away the nest’s position behind an arbour of foliage. Mrs White-Winged Duck responds with a quick quack-quack. Rofikul Islam raises an arm, winks at his team. And they, finger on trigger, behold Assam’s state bird—so elusive and endangered that perhaps only 200 pairs remain in the wild on this planet—with unabashed sideways glances of looky-loos. They go click, click, click. But the light is low; the sun has just yawned out on this island in the Jia Bhoroli, the livewire of Nameri national park straddling Assam and Arunachal Pradesh.