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For years, park rangers in South Africa have tried to stop poachers who kill rhinos for their valuable horns. But it’s impossible to keep up–and rhinoceros populations have continued to fall. Bloomberg Businessweek contributor Jonathan Franklin reports that now, the rangers are taking a creative new approach to outmaneuver the poachers—and protect the animals.

Read more: A Rhino Is Worth More Dead Than Alive

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This episode was produced by: Supervising Producer: Vicki Vergolina, Senior Producer: Kathryn Fink, Producer: Rebecca Chaisson, Associate Producer: Sam Gebauer. Sound Design/Engineer: Raphael Amsili. With additional production support from Magnus Henriksson, Abraiya Ruffin and Nayeli Jaramillo-Plata.