Koko was born at the San Francisco Zoo and she lives in Woodside. The Bay Area organization that cares for her is celebrating with a birthday haiku contest.
The Gorilla Foundation asked people to post the poems about Koko on Twitter. More than 100 were submitted through June.
Monday the foundation announced the winning poem tweeted by user @met314.
"Gentle lady ape
Nimble fingers share her thoughts
Teaching us to love"
The winner will receive a painting by Koko.