Koko and her kittens: Watch the extraordinary moment a gentle gorilla adopts two tiny cats and showers them with cuddles - because she doesn't have babies of her own 

  • Koko, who lives in Woodside hill in California, adores babies - despite not having mothered any of her own
  • In celebration of turning 44 years old, the ape's trainer, Francine Patterson, introduced her to litter of kittens
  • Gorilla, who is famous for 'sign language', was filmed stroking them gently before picking one up for cuddle
  • She then gestured for one cat to be placed on her head, before later signing that the animals are her babies
  • Koko, who was born at San Francisco Zoo, has now adopted two of the kittens; it has 'energized her world'
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 mother 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, her trainer Francine Patterson introduced her to some other babies - a litter of kittens.
The meeting - arranged on behalf of The Gorilla Foundation - was not the first time that Koko has interacted with tiny cats.
But her reaction to doing so was as genuine and heart-warming as if it was.