Colo is the first gorilla in the world born in a zoo and has surpassed the usual life expectancy of captive gorillas by two decades.
She is a mother of three, grandmother of 16, great-grandmother of 12 and great-great-grandmother of three. Zoo officials recently removed a malignant tumor but say she`s doing well.
Experts say improved medical care, better nutrition and up-to-date therapeutic techniques are helping lengthen zoo animals` lives.
The changes also mean more animals living with the aches and pains of growing older.
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