Koko with her lifelong friend Francine "Penny" Patterson, an animal psychologist who taught the gorilla sign language, in 1972. Alamy Stock Photo Koko, a western lowland gorilla said to have mastered American Sign Language, has died aged 46, the...
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Koko with her lifelong friend Francine "Penny" Patterson, an animal psychologist who taught the gorilla sign language, in 1972. Alamy Stock Photo Koko, a western lowland gorilla said to have mastered American Sign Language, has died aged 46, the...
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