The researchers describe it as a "potential" example of tool use among wolves.
The famed primatologist's research on chimpanzees redefined what it meant to be human.
A capuchin named Joker started the apparent trend, leading researchers to suspect "there was something a little quirky about him, or that he was kind of lonely in a way.”
The famous ape reportedly knew thousands of words, loved Clint Eastwood movies, and was a big fan of video games.
