PLENTY OF PEOPLE know that leopards wander the streets of Mumbai, but few people ever see them. The elusive cats hunt at night, shrouded by darkness and the din of the city. That made Gordon Buchanan’s job tricky. The BBC sent Buchanan to Mumbai to film those cats for Planet Earth II, the epic nature documentary series that wraps up this weekend on BBC America. Filming wildlife isn’t like shooting a movie; the stars ignore your schedule and rarely appear when or where you want them to. You make your best guess about what might happen, set up your gear, and wait—sometimes for days. Buchanan did just that, erecting infrared “camera traps” throughout the leopard’s territory and checking them daily to discern its routine. Once he had a sense of the animal’s habits, Buchanan spent night after night hidden in a blind, panning the horizon with his camera, hoping to glimpse his quarry.

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