The plains of Africa have always been a hotbed of predator action, but lurking in its rivers is perhaps its most elusive killer: the Goliath tigerfish. Legends say they are man-eaters, that even ...

Below are the key discoveries: A new species of pygmy pipehorse, Cylix nkosi, was found in the Indian Ocean near South Africa ... A vegetarian piranha, Myloplus sauron, was discovered in Brazil ...