Recognizing and Reflecting on a Rescue’s Lasting Legacy
Tanner’s journey began years before he was rescued and joined Shedd Aquarium’s all-male herd or colony of California sea lions. For us, his story was one of a persistent, salmon-loving marine mammal that was unintentionally overfishing endangered Chinook salmon. Tanner was easily identified by the mark on his back that he arrived with that read “CO11.” Both his name and branding told a story about his rescue.
Named for Tanner Creek near where he was found, he was part of a government effort to relocate or remove sea lions from the Bonneville Dam area to protect the endangered fish they were consuming. Identified by his marking, wildlife officials could keep a close eye on the specific sea lions. After attempts to relocate the animals hundreds of miles away, several sea lions returned to the dam. At that point, officials and the marine mammal community collaborated to find “CO11,” and other sea lions, a suitable home with an accredited facility.
After receiving a second chance at life and during his time with us, Tanner received all the nutrition and care necessary from caretakers and veterinarians at the aquarium. He was introduced to and interacted with the other male sea lion companions, including his offspring Charger and grand-pup Kenney. Additionally, he served as an ambassador for his species, inspiring millions of guests who spotted him sunbathing, swimming and sounding off on exhibit.
As the oldest sea lion at the aquarium, estimated in his mid-to-late 20s, he exceeded the life expectancy of his wild counterparts. As such, he experienced some expected things that are associated with old age, too. As he got older, our animal care team continued learning about geriatric care and finding innovative ways to keep him and other older residents comfortable throughout their lives. Our team of specialized veterinarians and caretakers conducted an exploratory examination that required us to sedate Tanner, which found a tumor mass. Although Tanner has received periodic sedation in the past as part of other routine care and historically recovered uneventfully – this time, he did not. Like in humans, anesthetic procedures carry minimal, but inherent risks and are necessary to complete certain medical interventions.
We will never know the full story of Tanner’s life. He arrived as an adult sea lion in need of a home, or officials would have made the difficult decision to euthanize him 12 years ago. We are thankful to accredited zoos and aquariums that stepped up for this population of sea lions to rehome these incredible marine mammals. It is a testament to the expertise, resources and facilities allowing rescue efforts like this to be possible. While we grieve this loss of Tanner, our caretakers continue to care and provide for rescues like Laguna and Cruz, as well as the lineage of Charger and Kenny. We are touched by the support and understanding of our community during these difficult times.