AdvertisementRare Black Rhino Killed By U.S. Hunter Who Won Controversial AuctionMay 20, 2015Bill ChappellfacebookEmailAn endangered black rhino is seen in this file photo from the Etosha National Park in norhern Namibia last year. An American hunter has killed one of the animals, under a special permit he bought for $350,000. While the rhinoceros is referred to as black, its colors vary from shades of brown to gray. (DPA /LANDOV)