Leave the rhinos alone. Their horns don’t have medicinal properties, and ingesting rhino horn is the same as chewing your own fingernails.
I KEPT a rhinoceros beetle as a pet before I ever encountered a real rhinoceros. It must have belonged to the species Oryc tes rhinoceros as our house bordered oil palms. I never thought of these exquisite playthings as a pest even though (I now know) they can defoliate and sometimes kill coconut and oil palms.
