A number of animators drew scenes with King Louie's monkey gang for The Jungle Book.
Those crowd shots are a lot of work, since each monkey's movements need to work as a single character as well as within a group.
I am not sure who is responsible for these action studies on a model sheet, but I sure like the life in them and the attitudes. (I don't think it is Ken Anderson's work.)
The final designs were set by -you guesses it- Milt Kahl. Again, his superb sense for simplifying complex anatomy is evident in every pose. But there is personality coming through as well.
These mischievous monkeys can be trouble.