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Human brains are 2.04 per cent of body weight; dolphin brains are the next largest at 0.94 per cent. Dolphin play is highly complex, and they learn fast. They have a striking ability to follow extraordinarily complicated human commands, and can recognise themselves in a mirror. They can even use tools: when hunting among sharp coral they attach bits of sponge to their snouts as safety masks. But they can’t breathe without thinking about it, so only half of their brains can go to sleep at one time, otherwise they would suffocate.