Kim Willsher “Rhino shot dead by poachers at French zoo” https://www.theguardian.com/world/2017/mar/07/rhino-shot-dead-by-poachers-at-french-zoo
A rhinoceros horn has an estimated value of between €30,000 and €40,000. Detectives say there is an established trade network in illegally poached horn between France and Asia.
The white rhino is an endangered species, with an estimated 21,000 remaining in the wild across the world, mainly in South Africa and Uganda. Their horns are sought after in Asia, where they are valued for their supposed aphrodisiac qualities.
In Zimbabwe last autumn, the authorities announced they would remove the horns of 700 adult rhinoceros to dissuade attacks from poachers.
*1:See Associated Press “Beloved hippopotamus 'Gustavito' beaten to death at El Salvador zoo” https://www.theguardian.com/world/2017/feb/27/el-salvador-hippopotamus-beaten-death-gustavito Mentioned in http://d.hatena.ne.jp/sumita-m/20170301/1488384770
*2:See eg. WWF “White Rhino” https://www.worldwildlife.org/species/white-rhino International Rhino Foundation “White Rhino(Ceratotherium simum)” http://rhinos.org/species/white-rhino/ https://en.wikipedia.org/wiki/White_rhinoceros https://ja.wikipedia.org/wiki/%E3%82%B7%E3%83%AD%E3%82%B5%E3%82%A4 See also http://d.hatena.ne.jp/sumita-m/20070924/1190636959