For centuries, humans and dolphins have enjoyed a special relationship, evident not just in mythology and folklore but in many documented encounters. Some past cultures even worshipped dolphins and condemned anyone who killed or wounded of them. Yet in recent decades, a paradox: on the one hand, we have discovered extraordinary depths of dolphin intelligence and their emotional lives, to the point of glimpsing their self-consciousness—on the other hand, in Japan, dolphins are slaughtered indiscriminately, and several nations keep them in cruel conditions.