Happy, who taught researchers that elephants can recognize themselves, is euthanized at Bronx Zoo

A Bronx Zoo elephant who gave researchers new insights and became the crux of a closely watched animal rights case has died

A Bronx Zoo elephant who gave researchers new insights and became the crux of a closely watched animal rights case has died

A Bronx Zoo elephant who gave researchers new insights and became the crux of a closely watched animal rights case has died