Overview
- Happy was euthanized after hospice care on Tuesday, May 26, 2026, as veterinarians cited progressive age‑related decline and failing organ signs that worsened despite treatment.
- A necropsy reported severe arthritis and large, inoperable uterine tumors that are hard to detect in elephants with routine exams or imaging and likely contributed to her decline.
- Happy gained scientific fame in 2005 for a mirror self‑recognition test that provided evidence of elephant self‑awareness and shaped debates about animal cognition.
- The Nonhuman Rights Project sued in 2018 to have Happy declared a legal person and moved to a sanctuary, a claim New York’s highest court rejected by a 5‑2 vote while two judges issued strong dissents.
- With Happy gone, 57‑year‑old Patty is now the Bronx Zoo’s only elephant on exhibit and the Wildlife Conservation Society says it will carefully review any future steps for her care under professional standards.