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Jia Jia, born July 28, 1978, has far exceeded the average panda lifespan of 25 years and Paolo Martelli, the park's head veterinarian, said the panda's long life can be partially attributed to good genes.
"Some animals are part of a good stock, and we can assume that Jia Jia got lucky in her genetic make-up," he told CNN.
Jia Jia was treated to a Guinness-themed birthday cake made from ice, grenadine, mint syrup and apple.