A group of Japanese monkeys soak themseves in the hot spring at the Hakodate Tropical Garden in Yunokawa Hot Spring resort, Hakodate, Hokkaido Prefecture on December 14, 2021. The monkeys are delicate and sensitive to the temperature and they can relax and enjoy in a hot spring, of which the temperature should be around 40 C degrees. (Photo by Noriaki Sasaki/The Yomiuri Shimbun via AFP Photo)
