One of the founding members of the Woodland Park Zoo’s gorilla family died Friday.

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One of the founding members of the Woodland Park Zoo’s gorilla family died Friday after losing consciousness, according to a zoo report.

Nina the gorilla was found not moving under a tree after behaving regularly in the morning, the release said. She was taken to the zoo’s veterinary hospital and euthanized later in the day. She was 47, the oldest female gorilla at the zoo.

Gorillas are known to live into their 40s or 50s in zoos, and up to 30 or 35 years in the wild, the release said. A necropsy will be performed, and an official cause of death announced in the upcoming weeks.

Nina had lived at Woodland Park since 1968, according to the release. She was a lifetime member of the zoo along with her male companion gorilla Pete, who is still alive.

Nina, Pete and orangutan twins Towan and Chinta had a big birthday celebration at the zoo in February, all turning 47. Eight gorillas remain in the park grounds.