Koko (born July 4, 1971) is a female western lowland gorilla who is able to understand more than 1,000 signs based on American Sign Language and understand approximately 2,000 words of spoken English.
Although not unique, Koko is one of the few non-humans known to keep pets. She has cared for several cats over the years and Koko’s relationship with All Ball was featured in the 1987 book Koko’s Kitten.
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