A pair of evolutionary biomechanics specialists at the University of London’s, Royal Veterinary College, has found that when hippos run at full speed, all four of their feet are regularly in the air. A pair of evolutionary biomechanics specialists at the University of London’s, Royal Veterinary College, has found that when hippos run at full speed, all four of their feet are regularly in the air. Plants & Animals Phys.org – latest science and technology news stories