In this 2016 photo provided by the Cincinnati Zoo and Botanical Garden the silverback gorilla Ndume picks up a toy at The Gorilla Foundation’s preserve in California’s Santa Cruz mountains. The Cincinnati Zoo is suing for the return of Ndume, a gorilla loaned to the conservatory in 1991 as a companion for Koko, the gorilla famed for mastering sign language. (Ron Evans/Cincinnati Zoo and Botanical Garden via AP)
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