Gorilla and Orangutan Brains: Implications for Human Evolution

[iancampbell]

Interesting read, thank you.

I feel immaturely obligated to point out that brains are not the only scale-up from primates, there's also an increase in male anatomy.

Funny! On a semi-serious note, I remember reading somewhere that one postulated reason for the shape of the glans penis is to scrape out the semen of competitors. Also, not all primates are the same in this respect; IIRC, gorilla testicles are smaller than those of humans. Presumably because they have a fairly common system of one dominant male with a harem. Chimps, and even more so bonobos, do things rather differently. No idea about orangutans.