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Meet Japan’s hot spring bathing monkeys.
High in the snowy mountains of Nagano, Japanese macaques have mastered the art of winter wellness. At Jigokudani Monkey Park, these “snow monkeys” are famous for soaking in natural hot springs—a behavior scientists say began in the 1960s after a young macaque mimicked a human bather. Over time, the ritual, which allows the primates to stay warm in the winter, became widespread among the macaques in the region.