PORTLAND -- The oldest resident of the Oregon Zoo, Coco the chimpanzee, has died, zoo officials announced Friday.

She suffered a debilitating medical issue earlier in the week and the most humane option was to euthanize her, according to Jennifer Davis, the curator of the zoo's primate area.

At around 60 years old, Coco had been the oldest animal at the Oregon Zoo and the second-oldest chimp in the entire U.S. zoo population, said spokesman Hova Najarian. The median life expectancy for chimpanzees is 31.7 years for males and 38.7 years for females.

Her actual birth date was unknown; Coco was donated to the Oregon Zoo in 1961.

Coco is survived at the zoo by two of her daughters Delilah, 39, and Leah, 38 along with their troop-mate Chloe, who is around 43, Najarian said.

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