In a remote rainforest in Madagascar’s northeast, Doménico Randimbiharinirina and Dominik Schüßler wandered into a ghost town. Its inhabitants were long gone, and the wooden frames and thatched roofs of dozens of huts slumped and rotted into creeping vegetation. Locals had told the two scientists about this abandoned village. About three years earlier, it was home to more than a hundred people. But then the residents fled. They rebuilt their village several miles away, unwilling to return to this place after seeing an evil omen: an aye-aye lemur. The endangered…