Cutting off rhinos' horns is a contentious last resort to stop poaching. A new study found it works

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FILE -- In this file photo taken Feb. 15, 2016, a de-horned rhino and her calf rest in their corral at a rhino orphanage in the Hluhluwe-iMfolozi Game Reserve in the KwaZulu Natal province South Africa. (AP Photo/Denis Farrell-File)