I want to know the answer to the following question:
What animals sexual behavior did Yerkes study?
All the background I'm provided with is that "The behavioral scientists at Yale, led by President James R. Angell and psychobiologist Robert M. Yerkes, tapped into foundation largesse by crafting research programs aimed to investigate, then suggest, ways to control, sexual and social behavior.". Is that enough to answer the question?
Answer: no