The snow monkeys’ onsen practice isn’t solely about warming their bodies or bobbing for apples — like the Japanese and visitors to Japan, they seem to appreciate onsen for its stress-reducing properties. Since the macaque’s thick coats keep them warm, and they take a dip even when there are no apples in sight, researchers’ studying the monkeys at Jigokudani believe hot springs function primarily to ease their tension.Joshua Mellin (CNN)