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SAN DIEGO - The veterinary staff at the San Diego Zoo had to perform a rare emergency c-section on one of the animals.

An 18-year-old gorilla gave birth via caesarian-section Wednesday night.

It's a rare procedure for a gorilla. San Diego Zoo had several outside consultants on the emergency surgery, including human neonatal specialists at UCSD Medical Center.

The baby gorilla weighed just over 4 ½ pounds. It had some complications, so the baby is being held in intensive care at the veterinary hospital receiving oxygen and fluids.

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