We can learn a lot about gender from apes.
What Frans de Waal knows about chimps and bonobos is probably not worth knowing. His latest book is about the subject of gender, as expressed in chimp and bonobo society. Both chimps and bonobos live in very complex groupings. It turns out that gender is not just a knotty topic in human society. My forthcoming book, The sentient robot, proposes that consciousness evolved to promote individual, prosocial decision-making and flexible thinking. This was of huge importance in complex societies. I do not believe that most animals possess consciousness but I reckon that chimps and bonobos do.
You may also like to browse other ethology posts: https://www.thesentientrobot.com/category/ethology/