L ike humans, some other primates like to huddle in hot springs. Japanese macaques ( Macaca fuscata ), also called “snow monkeys,” famously gather at natural hot springs to soak together for hours.

They found that bathing in hot springs subtly reshapes the snow monkeys’ relationships with their parasites and gut microbes.

On t.-p., "Carnegie institution of Washington. Publication 538." The institution, in a letter dated Apr. 10, 1943, states that this work, erroneously issued as its Publication 538, is to be considered ...