FILE - In this 2016 file photo provided by the Cincinnati Zoo and Botanical Garden, Ndume stands in 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, File)
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