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You've probably heard of black and white rhinos. But if you've ever seen one, you'll know that rhinos are actually earthy coloured. The terms black and white are based on a mishearing of the German word weid for the Square-lipped (white) Rhino which, as its name suggests, has a broad mouth for chewing grass as opposed to the hooked -lipped (black) rhino which has a more delicate mouth for tearing leaves from trees.