The Panna Tiger Reserve in Bhopal, India, is a conservation success story. After tigers disappeared entirely from the park in 2009, officials there successfully reintroduced breeding pairs of the big cats into the wild. Yet the rough terrain where tigers have found sanctuary also offers hiding places for poachers. That’s why, in 2014, the Indian government started testing the use of unmanned aerial vehicles (UAVs)—colloquially known as drones—to monitor both the endangered cats and the...

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