At roughly 2 years of age, Koki was captured by well meaning humans after he was struck by a vessel and injured. He was rehabilitated and recieved a prosthetic tail to replace the one that needed to be amputated. His prothetic was permenently grafted to his body, at least at the second go around. The first prosthetic he recieved was removable, but in a different dolphinarium- or, as they prefered to refer to themselves as, a "research" facility- he was fitted with a perment prosthetic. He was supposed to go home. He was supposed to be free. But humans can be cruel and he was instead kept in a concrete tank, a world much different than the one he knew, the one where the sea would comfort and sing to those who would listen. Where he could swim freely. Where he would be safe.