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

Happy, a 55-year-old Asian elephant at the Bronx Zoo known for demonstrating self-awareness through mirror recognition, was euthanized due to age-related health issues. She became central to an animal rights case and served as an ambassador for elephant conservation. The Bronx Zoo now has only one elephant, Patty, following Happy's death.