The gorilla used sign language to communicate to her trainer that the kittens are her babies, and the staff let Koko keep Ms. Gray, as well as another kitten named "Ms. Black" to raise as her own.

Koko the gorilla holds a kitten. The Gorilla Foundation/Koko.org, file "To look into the eyes of a 300-pound gorilla and have her tell you what she's thinking is truly humbling," actress Betty ...

Koko, the western lowland gorilla who learned to communicate with sign language, cuddles her new kitten at the Gorilla Foundation in Woodside, Calif., in 1985. Koko died this week at the age of 46 ...

The second cover, from 1985, showed the large western lowland gorilla cradling a kitten. Koko had asked for a kitten for Christmas in 1984. Her caretakers gave her a stuffed animal, but that didn ...

Koko the Gorilla, Who Mastered Sign ... With these signs, Koko was able to express her feelings, showing joy over receiving a pet kitten and sadness of the death of celebrity friend Robin Williams.

Throughout Koko’s life, she’s been taught to understand over 2,000 English words and can even communicate with her trainers using over 1,000 signs of what the Gorilla Foundation calls ...

Koko, the thoughtful gorilla who captivated the world through her ability to use sign language and revealed an empathetic side to great apes, has died. She was 46. The western lowland gorilla passe… ...

The second cover, from 1985, showed the large western lowland gorilla cradling a kitten. Koko had asked for a kitten for Christmas in 1984. Her caretakers gave her a stuffed animal, but that didn ...

Koko, the cat-loving western lowland gorilla who spoke sign language and had celebrity friends like Robin Williams, ... Koko chose a gray and white kitten that she named “All Ball.” ...

The world was enchanted when Koko the gorilla got her first pet in 1984, a gray kitten that she named All Ball. Now, 44-year-old Koko has doubled her joy by adopting two new kittens.

Koko, the gorilla who became an ambassador to the human world through her ability to communicate, has died. She's seen here at age 4, telling psychologist Francine "Penny" Patterson (left) that ...

Koko was born 46 years ago at the San Francisco Zoo. She was taught sign language by Dr. Francine Patterson starting in 1974, The Associated Press reported. She had a vocabulary of about 1,000 ...