"Why do primates that eat fruit tend to have bigger brains than those that eat leaves? Leaves grow everywhere and one leaf is generally as good as another. Frui

"Why do primates that eat fruit tend to have bigger brains than those that eat leaves? Leaves grow everywhere and one leaf is generally as good as another. Fruit tends to grow in specific places and ripens at different times. Primates that had to learn when and where ripe fruit would be tended to need bigger brains." A bigger brain is very energetically demanding and fruits are a lot energetic than leaves. Maybe, only primates that eat fruit can afford big brains?