You remember Koko the gorilla, right?

Koko was born in the '70s at the San Francisco Zoo. Francine (Penny) Patterson, then a Ph.D. candidate at Stanford, started studying young Koko's linguistics capabilities and eventually taught her a rudimentary version of sign language.

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Heroes

Another year, another epic birthday for Colo, the oldest known gorilla on Earth.

Colo, the world's oldest gorilla, is a great-great-grandma at the Columbus Zoo.

Today, Colo — the oldest living gorilla in captivity — turns 59 years old!

In Ohio, where Colo lives at the Columbus Zoo, they're celebrating in style.

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