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Koko, gorilla who used American sign language, dies in California

CALIFORNIA: Koko, a western lowland gorilla said to have mastered American Sign Language, has died aged 46, the California institute which studied her said on Thursday. “The Gorilla Foundation is sad to announce the passing of our beloved Koko,” the research center said in a statement, adding she passed away in her sleep. Koko was among a handful of primates who could communicate using sign language; others included Washoe, a female chimpanzee in Washington state, and Chantek, a male orangutan in Atlanta. Her keepers…