427 cases going back 50 years show monkeys keep pets, too — shedding a light on the origins of animal friendship | Fortune0

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• August 10, 2026

The first time I saw it, I wasn’t quite sure what I was looking at. A northern white-cheeked gibbon at Shanghai Zoo was holding and caressing a mouse that had wandered into its enclosure. It wasn’t trying to eat it or chase it away. Instead, the gibbon treated the tiny rodent with remarkable gentleness. I