Sudan, the last known male of the northern white rhinoceros subspecies, stands for his close-up in a paddock last year at the Ol Pejeta Conservancy in Kenya. If Tinder users swipe right on Sudan's profile, they're taken to a page asking for contributions to help him reproduce.
Tony Karumba/AFP/Getty Images
A Vietnamese rhino horn user displays her horn, which was a gift from her well-to-do sister. Last year, rhino horn sold for up to $1,400 an ounce in Vietnam, about the price of gold these days.