So pretty much the whole reason I went to Suzaka was to see these monkeys…
They are Japanese macaque, and with the except of humans, no other primate lives in a colder or more northern climate. So what do they do to deal with the cold? Sit in the hot springs of course! These monkeys live up in the hills at night, and come down to the onsen during the day to relax! What a hard life!
Mansfield's Sojourn in Japan 