Puan, believed to be the world’s oldest Sumatran orangutan, was euthanised on account of age-related complications at Perth Zoo on Monday. She was 62.

“It is always hard to make that decision for any animal, but it was the right decision and a respectful end for an old lady who demanded respect throughout her life,” said Perth Zoo’s Primate Supervisor Holly Thompson.

The Guinness World Records had recognised Puan as the oldest of her species in 2016. Zoo officials said the critically-endangered species rarely live up to the age of 50 in the wild. Puan was known as the Grand Old Lady of Perth Zoo.

Th zoo said she was believed to have been born in a jungle in Indonesia’s Sumatra in 1956 and was brought to the facility in 1968. She is survived by 54 descendants across the United States, Europe and elsewhere. “She did not suffer fools, you always knew where you stood with Puan, and she would actually stamp her foot if she was dissatisfied with something you did!” Thompson added.