KoKo the Gorilla
Koko is a western lowland gorilla. She was born July 4, 1971; and is now 44 years old. She does not have any babies, but she has had many pet cats that she treats like her baby.
Koko can understand over 1,000 signs and can understand over 2,000 spoken English words. Her trainer Francine (Penny) Patterson calls this "gorilla sign language".