OKLAHOMA CITY — The Oklahoma City Zoo and Botanical Garden is saddened to announce the passing of its oldest Asian elephant, Rex, who was humanely euthanized on Tuesday, Jan. 14, 2025.
Rex, approximately 57 years old, was being treated for advanced osteoarthritis and other age-related health issues. His caretakers closely monitored his condition, implementing a geriatric care program that included medications, physical therapy, and habitat modifications to support his mobility.
Recently, Rex experienced a noticeable decline, including reduced mobility, increased stiffness, and discomfort in his legs and feet. These changes indicated chronic pain that could no longer be alleviated through medical or therapeutic interventions.
With his quality of life significantly diminished, the Zoo’s veterinary and elephant care teams made the difficult decision to euthanize him. Rex passed away peacefully in the Zoo’s elephant barn at Sanctuary Asia, surrounded by his caretakers.
“Rex’s life and continuing legacy will not be forgotten. He was the cornerstone of the Oklahoma City Zoo’s elephant breeding program and the proud father of our three young females,” said Rachel Boyd, the Zoo’s elephant curator.
At 57, Rex was considered geriatric, nearing or exceeding the average life expectancy for Asian elephants. He was among the oldest male Asian elephants in the Association of Zoos and Aquariums’ (AZA) managed population. As an accredited AZA member, the OKC Zoo is dedicated to providing exceptional care throughout an animal’s life, often enabling them to live significantly longer than their wild counterparts due to advanced veterinary care and wellbeing practices.
Rex joined the OKC Zoo family in December 2011 from African Lion Safari in Hamilton, Canada, through a breeding recommendation by AZA’s Species Survival Plan® for Asian elephants. His arrival, supported by a community fundraising campaign dubbed “Rex’s Trek,” marked the launch of the Zoo’s Asian elephant breeding program. Rex fathered three calves—Achara, Kairavi, and Rama. Achara is expecting her first calf this July, marking a third generation for the Zoo’s elephant family.
“Rex’s influence not only shaped the future of the Zoo’s herd but also our continued commitment to conservation and animal care,” Boyd said. “His enduring legacy lives on through his seven living calves and five grand calves, including three here at the Zoo. Rex was truly a remarkable presence, and I feel honored to have cared for him in the final years of his life.”
A favorite among Zoo visitors, Rex was recognized for his large tusks and freckled forehead. He preferred a solitary lifestyle, often enjoying separate habitats from his herd mates. He loved smashing enrichment treats like watermelons and pumpkins and swimming in the habitat pools.
To honor Rex’s memory, the Zoo encourages fans to share their photos and memories on its social media channels @okczoo.
The OKC Zoo has cared for elephants since 1930, connecting millions to these endangered animals. The Zoo works with global partners and supports research to ensure the survival of Asian elephants, which are listed as endangered. Over the past 15 years, the Zoo has contributed more than $450,000 to elephant conservation projects, including efforts to mitigate human-elephant conflict, prevent poaching, and protect habitats in Asia.
The OKC Zoo is also the only AZA-accredited institution conducting research in Sri Lanka to better understand Asian elephant social dynamics, land use, and the impacts of tourism. This research helps inform wild elephant management strategies in areas with high levels of human-elephant conflict.
The Zoo is currently home to seven Asian elephants: Asha, 29; Chandra, 28; Kandula, 23; Bowie, 11; Achara, 10; Kairavi, 6; and Rama, 2. Achara and Bowie are both expecting their first calves this July.
Founder, publisher, and editor of Oklahoma City Free Press. Brett continues to contribute reports and photography to this site as he runs the business.