Ind. zoo says dolphin died from heart problems

City zoo officials have determined that its 24-year-old Atlantic bottlenose dolphin died from cardiac problems.

Phoenix, a female dolphin, died June 24 of a problem similar to a heart attack, said zoo senior veterinarian Dr. Jeff Proudfoot.

Possible risk factors for the problem are similar to those of humans: genetics, infections, viruses or circulatory problems.

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"We just don't know at this point exactly why this happened," Proudfoot said Wednesday in a statement by the zoo, "but we're going to go back and do some good science and try to understand this disease process more clearly."

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Phoenix had behaved and eaten normally before her death, and had a physical examination in May that did not indicate any problems, zoo officials have said.

Dolphins in captivity typically live more than 25 years.