Rhinoceros are illegally poached for their horn which is supposedly regarded as an aphrodisiac in China (this actually is a myth, it's really for traditional medicine to treat fevers and convulsions. But the poaching problem is real).
Allansia, the Fighting Fantasy world has intelligent Rhinomen (I used to treat them as Bugbears under Mentzer Red Box rules). Who have horns.
There's a lot of encounter material potential from combining those two ideas.