The world is down to a single known male northern white rhino, and he is now under 24-hour armed guard.

The world is down to a single known male northern white rhino, and he is now under 24-hour armed guard. 
He is called Sudan and staffers at the Ol Pejeta Conservancy in Kenya are hoping the 42-year-old is able to conceive with one of the two female northern white rhinos. But given his age, chances are not looking good and other breeding methods are being explored. 


Though the animal lives on a preserve that houses fierce predators like lions and cheetahs, its keepers are mos