Koko the gorilla who mastered sign language dies age 46

A gorilla who learned to communicate in sign language has died at the age of 46.

Koko the gorilla who mastered sign language dies age 46

A gorilla who learned to communicate in sign language has died at the age of 46.

Western lowland gorilla Koko died at the Gorilla Foundation's preserve in California's Santa Cruz mountains on Tuesday.

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