猿神
Sarugami look just like the wild monkeys that are found across the Japanese islands. However, they are bigger, more vicious, and much smarter. They can speak, and sometimes they are seen wearing human clothes as well. They are thought to be the remnants of an ancient monkey worshiping cult. All that is left of this religion today are wicked monkey spirits who have degenerated into yōkai.
Sarugami behave for the most part like wild monkeys. They live in the mountains and tend to stay away from human-inhabited areas. Because they are bigger and smarter than most of the animals around them
When sarugami interact with humans it almost always ends in violence. Most legends follow a similar pattern: a sarugami kidnaps a young woman from a villager, and heroes are called upon to go into the wilderness and exterminate the sarugami. Like oni, giant snakes, and other monsters, sarugami are beasts meant to be slain by brave samurai.
Read more: http://yokai.com/sarugami/