> I think you're too harsh. What I noticed is that male
> and female bonobos are equal in size and strength, and
> thus, I understood (maybe I got it wrong) there is no
> male dominance.
>
> To me that figures. With physical equality comes sexual
> equality, and a great increase in sex. Of all sorts.
Darwinians attribute male size relative to female as an adaptation to competition for the most fit [in a Darwinian sense] females. The greater the equality in size, the less the competition between males. With the Bonobos, the females are indiscriminately promiscuous so there is little male competition for females,little male dominance and so it seems no jealousy[ Bonobos never fight or engage in anti-social behavior].
Species like Gorillas who physically fight each other for females typically have much larger bodies than females. So, its the other way 'round, more sex and more sexual partners leads to equal physical size and strength.
Sam Pawlett