The Heartwarming Moment Koko Adopts Two Kittens - Because She Can't Have Babies Of Her Own

Koko the gorilla is famous for having learned a large number of hand signs from a modified version of American Sign Language.

But less well known is the fact that she absolutely loves babies - despite not having had the opportunity to have any of her own.

She often signs the word ‘baby’, carries gorilla dolls in her arms, and even pretends that her dolls can sign by moving their arms and hands.

So in celebration of the ape's 44th birthday, exactly a year ago today, her trainer Francine Patterson introduced her to some other babies - a litter of kittens.

Watch the heartwarming moment she meets the kittens here...