Shot at Ueno Zoo in Ueno, Tokyo. There was an apery in the zoo. Many Japanese monkeys were seen there. They are social animals and every group has a boss. So it means that the world of the monkeys is also an unequal society like the human society.
During I was thinking such thing, I found a monkey sitting on the top of the rock mountain. Its mouth opened a little and it made him unsmart. It didn't have an air of dignity. So it might not be the boss unfortunately.