At Japan's Jigokudani Monkey Park on Feb. 17, Japanese Macaque monkeys take their annual winter bath.
Koichi Kamoshida/Getty Images
Japanese Macaque monkeys relax in the hot spring at the Jigokudani (Hell's Valley) Monkey Park on February 17, 2008 in Jigokudani, Nagano, Japan.
This Macaque troop regularly visits the springs to escape the cold. It's a behavior originating from a female Macaque which ventured into the hot springs to retrieve soybeans in 1963.