HAKODATE, Hokkaido -- The annual "Monkey Mountain Hot Spring" event at the Hakodate Tropical Botanical Garden here has been drawing increasing foreign visitor numbers in recent years. The December to ...

YAMANOUCHI, Nagano Prefecture—Visitors to the popular monkey park here have been delighted by the sight of wild Japanese macaques soaking in hot springs to escape the winter chill. Approximately ...

Most famously, a group in Jigokudani Park warm themselves by soaking in hot springs called onsen. The behavior represents culture because the monkeys learn it socially, and it is isolated to a ...