A Vietnamese rhino horn user displays her horn, which was a gift from her well-to-do sister. Last year, rhino horn sold for up to $1,400 an ounce in Vietnam, about the price of gold these days. Frank Langfitt/NPR hide caption

itoggle caption Frank Langfitt/NPR

In late July, the Brussels Royal Institute for Natural Sciences Museum was among those targeted by horn robbers. Georges Gobet /AFP/Getty Images hide caption

itoggle caption Georges Gobet /AFP/Getty Images