
He said Shiloh, who measured 9 feet long and about 400 pounds, was not responding to treatments and had stopped eating before doctors made the decision to have her euthanized. She died in the medical pool late Sunday morning surrounded by three doctors, two veterinary technicians and eight trainers.
Whitaker said doctors who specialize in comparative medicine at the Johns Hopkins University School of Medicine are conducting an autopsy.
He said tests conducted over the past few months showed that Shiloh — one of the first six dolphins to be displayed in the new Marine Mammal Pavilion when it opened in 1990 — was suffering from an infection and iron storage disease. He said "next to nothing" is known about iron storage disease in dolphins, but it appeared that Shiloh was accumulating excessive amounts of iron in her liver, and treatments had begun about a year ago.
She was one of the aquarium's nine dolphins, ranging in age from 2 to 38 years. Whitaker and Sue Hunter, director of animal programs, said life expectancy for a bottlenose dolphin is about 25 years.

Hunter described Shiloh as a "gentle" and "calm" dolphin who was attentive to the other dolphins and helped to raise the calves born at the aquarium, showing "very motherly behavior and instincts."
In March 1992, Shiloh gave birth to Chesapeake, the first dolphin to be born at the aquarium.
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