Stay up to date with notifications from The IndependentNotifications can be managed in browser preferences.Jump to contentThank you for registeringPlease refresh the page or navigate to another page on the site to be automatically logged inPlease refresh your browser to be logged inAllNewsSportCultureLifestyle(AFP/GETTY IMAGES)Happy, a 55-year-old Asian elephant at the Bronx Zoo, was euthanized on Tuesday due to rapidly deteriorating age-related health conditions, including severe arthritis and inoperable uterine tumors. Happy gained scientific recognition in 2005 for her role in a study that demonstrated elephants possess self-awareness, a rare cognitive ability. Her captivity became the subject of a landmark animal rights lawsuit by the Nonhuman Rights Project, which argued for her legal recognition as a "person" and transfer to a sanctuary. New York's highest court ultimately rejected the activists' claim in a 5-2 decision, though two dissenting judges strongly criticized the ethics of her confinement. Happy's passing leaves Patty, a 57-year-old elephant, as the only remaining pachyderm at the Bronx Zoo, prompting officials to consider relocating her. In fullHappy the elephant’s final goodbye leaves Bronx Zoo staff in tearsThank you for registeringPlease refresh the page or navigate to another page on the site to be automatically logged inPlease refresh your browser to be logged in