The long answer: Rhino horns have been used for centuries ... Female rhinos don't start mating until the age of five. After ...

Rhino horns grow as much as three inches a year, and have been known to grow up to five feet long. Females use their horns to protect their young, while males use them to battle attackers.

Sudan, a northern white rhino and the last male of his subspecies, died Monday at the Ol Pejeta Conservancy in Kenya. The rhino — once called by the dating app Tinder as the “most eligible bac ...