http://www.courrierinternational.co....u-monde-entier
https://www.washingtonpost.com/news....=.18eca60117dc
TLDR : Rhinoceros shot in a French zoo for his horn, which is used for very obvious phallic reason as an aphrodisiac.
For the record, rhinoceros horn dealers are showing a considerable and even commendable desire toward tradition and authenticity in the aphrodisiac and industry, as a rhinoceros horn is made of keratine-AKA, the same proteine as human nails.