FILE - In this 2016 photo provided by the Cincinnati Zoo and Botanical Garden, Ndume stands in The Gorilla Foundation's preserve in California's Santa Cruz mountains. A federal judge in San Francisco has ruled the male silverback gorilla loaned to a California group in 1991 as a possible mate for Koko, the gorilla who learned sign language, must be returned to a Cincinnati zoo. District Judge Richard Seeborg’s ruling Friday, Feb. 1, 2019, says a 2015 agreement between the Cincinnati Zoo & Botanical Garden and Gorilla Foundation to return Ndume after Koko’s death must be enforced. Koko died in June at age 46. (Ron Evans/Cincinnati Zoo and Botanical Garden via AP)
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