Saddened visitors and staff members gathered to pay tribute to the beloved primate, which was one of the zoo's favorite attractions.
"It's always hard to make this decision in relation to any animal, but it was the right decision and a worthy end for older ladies", explained head of the Department of primates Holly Thompson.
The world's oldest Sumatran orangutan has died at a zoo in Western Australia.
"Puan had people who had been working with her for a long long time, with her till the very end", she said, struggling to keep her composure.
Some of Puan's descendants have been released back into the wild in Sumatra, the zoo said.
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At the Perth Zoo, Puan leaves behind two daughters, four grandchildren and a great grandson. Perth Zoo stated that due to the brilliant health care offered to Puan by the caretakers, she surpassed the usual life expectancy of her species.
"She didn't suffer fools, you always knew where you stood with her and she would actually stamp her foot if she was dissatisfied with something you did".
Perth zoo reported that unlike Puan who has been in the zoo since 1968, Sumatran orangutans rarely attain age 50 in the wild.
"To look at Puan is to look into the eyes of an animal (and I find even saying "animal" to feel slightly disrespectful) who has seen so much in her lifetime that the mind boggles", she wrote. "It fascinates me as to the stories she could tell".
There are less than 15,000 Sumatran orangutans living in the world at the moment, as per the World Wildlife Fund. She was a grand old lady who demanded respect and earned respect.
"Rest in peace Puan, may you climb happily in the jungles of the sky", she wrote.