Here's the "sacred baboon" Sylvia Plath found on the beach in Winthrop when she was two and a half years old, and described in her memoir "Ocean 1212-W":
The fact is that Sylvia did not find this sculpture. Her neighbor and playmate David Freeman found it, he said, between the ages of 8 and 14 (before 1946). It had drifted in covered with tar. David's father "figured it belonged to some sailor" and cleaned it. [1] The photograph is courtesy of David's sister Ruth Freeman, via Dr. Richard Larschan.
The ancient Egyptians honored Hamadryas baboons as one of the incarnations of their god of wisdom. They portrayed these sacred baboons in art and made mummies of them. This particular sculpture was more recent, a remnant of a then-new Western fascination with hominid intelligence and behavior. In the 1920s, U.S. psychobiologist Robert Yerkes adopted chimpanzees, published a book about them titled Almost Human, and founded the first primatology laboratory, at Yale (it's now at Emory). Popular interest, plus the influence of Egyptian art on modern sculpture, culminated in the Baboon Fountain featured at the 1939 New York World's Fair. The photo below shows two of the fountain's five godlike baboon figures, with the fair's iconic Pylon in the background.
[1] Harriet Rosenstein's notes from her interview with David Freeman on 17 July 1974, Emory.