Watch Koko the gorilla become adoptive mom to kittens for her birthday
Koko the gorilla is famous for learning sign language -- and so when the gorilla turned 44 today, her trainer wanted to give the gorilla a birthday present as incredible as her.
Koko has always loved babies, but has never had the opportunity to have any of her own. The gorilla, who gained international recognition for learning over 1,000 symbols of a modified American Sign Language, would frequently sign the word 'baby' and carry a gorilla doll in her arm.
Her trainer saw the gorilla's 44th birthday as the perfect opportunity to let Koko experience the joys of motherhood -- with an adorable litter of kittens.
A video shows Koko's introduction to the cuddly kittens. The occasion was on behalf of The Gorilla Foundation. Although the gorilla had interacted with small cats before, her meeting with these kittens was incredibly genuine and heartwarming.
The video shows Koko being introduced to a cardboard box with the litter inside. The gorilla immediately has a connection with one kitten named "Mrs. Gray." Koko picks up and cradles the small kitten in her arms, close to her chest.
At one point in the video Koko even signs to put the kitten on her head, which turns into an adorable moment. The video states that Koko and her two kittens are doing well and are on their way to becoming a happy family.
Watch the video below:
Watch Koko mourn over the passing of her friend, Robin Williams:
More from AOL.com:
Pregnant female chimp adopts adorable baby orphan in 'unheard of' act of kindness
Man named Santa Claus wins North Pole city council seat
83-year-old identical twins die within hours of each other
