The statue of "Darwin's Monkey"

The original name "Darwin's Theory of Evolution" is an extraordinary statue, which is a symbol of the evolution of life in the world and is located on Monkey Island (Hainan). The sculpture is a statue of a chimpanzee monkey sitting on a stack of books by Charles Darwin in the pose of a "Thinker" by Rodin. "Man descended from a monkey" is a popular thesis that Darwin was the first to express. What is this monkey thinking about? It is unlikely that she is looking for an answer to the question "to be or not to be." Rather, he is trying to look into the eyes of distant ancestors. Or descendants?