Gunther, a 33-year-old male gray seal at the Smithsonian’s National Zoo and Conservation Biology Institute, died on January 18, leaving behind a legacy as both an ambassador for his species and a favorite among visitors. Keepers and staff at the zoo are mourning his loss, reflecting on his long life and the role he played in marine mammal care and education. With a median life expectancy of 19 years for gray seals in human care, Gunther far outlived expectations, making his passing a significant moment for the American Trail exhibit.
The first signs of Gunther’s declining health appeared on January 11, when keepers noticed a decrease in appetite and energy. Concerned for his well-being, the zoo’s veterinary team initiated medical treatment, prescribing antibiotics, antinausea medications, and diuretics in an effort to improve his condition. Despite these interventions, his health continued to worsen, leading to further diagnostic procedures, including a bronchoscopy, echocardiogram, and abdominal ultrasound. Keepers and veterinarians worked to provide additional treatment, administering intravenous fluids and further antibiotics in hopes of stabilizing his condition. However, on the morning of January 18, Gunther went into cardiac arrest. Despite immediate medical response, resuscitation attempts were unsuccessful. The zoo is awaiting a final pathology report, which may provide more insight into the cause of his decline.
Gunther arrived at the National Zoo on November 5, 2012, alongside two female gray seals, Kjya and Kara, after previously living at Adventure Aquarium in Camden, New Jersey. The three had been housed together for years and were transferred to Washington, D.C., under the Association of Zoos and Aquariums’ Species Survival Plan. This program ensures that animals in human care are paired for breeding based on genetic diversity, temperament, and health. Before coming to the National Zoo, Gunther had already fathered two pups, Tasha and Lilly, in 2004. While living at the zoo, he successfully bred with Kara, producing two more pups, Rona in 2014 and Birdie in 2017.
Over the years, Gunther became well known for his easygoing personality and his ability to adapt to different training sessions, changes in his environment, and social dynamics within the seal colony. His cooperative nature made him a valuable member of the zoo’s animal care program, allowing keepers and veterinarians to develop and refine essential handling techniques for gray seals. His patient demeanor also provided new staff members the opportunity to learn best practices in marine mammal training and medical care.
During breeding season, Gunther displayed natural gray seal behaviors, such as slapping the water and herding the female seals, which offered both keepers and visitors a closer look at the instincts of his species. His presence on the American Trail exhibit helped educate the public about gray seals, a species rarely seen in zoo settings, fostering greater awareness about marine life and conservation.
Though gray seals are currently listed as a species of least concern by the International Union for Conservation of Nature, their populations were once severely depleted due to hunting for their oil, meat, and fur. By the mid-20th century, the species was on the brink of extinction in parts of North America. The passage of the Marine Mammal Protection Act in 1972 marked a turning point, allowing gray seal populations to recover. Today, they serve as an example of how wildlife protection laws can help species rebound when conservation efforts are enforced.
Gunther’s legacy at the National Zoo extends beyond his role as an exhibit animal. He played a vital part in conservation education, providing visitors with a direct connection to the species and the marine environments they inhabit. His participation in training sessions, veterinary procedures, and breeding programs contributed to the overall understanding of gray seals in human care. His impact will continue through the knowledge and awareness he helped inspire among zoo staff, visitors, and conservationists.
His passing is a great loss to the National Zoo, where he was a fixture of the American Trail for more than a decade. Keepers, veterinarians, and longtime visitors will remember him not only for his impressive size and dramatic behaviors but also for his gentle nature and ability to engage people with the natural world.
