Robotic fish built by robotic engineers at Essex University photographed in Bristol, England.These are the robot prototypes that will one day walk, swim and fly amongst us. Developed in Bristol and Essex, they are being designed to rescue us, clear our sewers and even become our companions. Some can walk, talk and dance, speak 20 languages and hold conversations and respond with life-like expressions. The ambitious scientists behind them even hope some of the humanoid designs will one day compete - and beat - humans in football matches. [Photo/CFP]