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Ailing Dolphin Dies At SeaWorld San Antonio

Dart the dolphin is the fourth death at the park since last summer.

Posted on February 9, 2016, at 7:31 p.m. ET

A 12-year-old dolphin died at SeaWorld in San Antonio over the weekend, becoming the fourth ocean mammal death at the park since last summer.

Dart, a Pacific white-sided dolphin, had been under constant veterinary care for about month for "health-related issues," but the exact cause of death had not been determined pending the results of a necropsy, SeaWorld announced.

Dart was with two of his dolphin companions (Betty and Hailey), as well as his caretakers, when he died.

Like many dolphins, Dart was high-energy, extremely playful, enjoyed participating in shows and interacting with his trainers.

He had been a member of the SeaWorld San Antonio family since his birth at the park in September 2003, and he will be missed by the entire SeaWorld family.

Betty, a 37-year-old Pacific white-sided dolphin who was one of Dart’s older companions, is also under 24-hour veterinary care for indications of inflammation or a possible infection, SeaWorld said.

The average lifespan of Pacific white-sided dolphins is believed to be anywhere between 36 and 40 years.

Dart is the latest in a series of deaths at the park.

In December 2015, Unna, an 18-year-old killer whale, died from a rare fungal infection. A month earlier, Stella, a female beluga whale, died in November after experiencing gastrointestinal problems. In July, a premature beluga calf also died.