Featured by Ed Stoddard/Undark
Does South Africa still need private rhino breeders to fight poaching?
John Hume might be keeping up to 13 percent of the world's white rhinos on his ranch. Not everyone thinks that's a good idea.
How 25 chinchillas could save a mountain
In Chile, a rare rodent sits atop 3.5 million ounces of extractable gold. Now a mining company is trying to trap and move them.