monkey
Definitions
A small to medium-sized primate that typically has a long tail, most kinds of which live in trees in tropical countries.
A mischievous or playful person, especially a child.
To behave in a silly or playful way; to tamper or meddle with something.
Examples
The curious monkey swung gracefully from branch to branch in the dense jungle.
Watching the monkey peel a banana was the highlight of our trip to the zoo.