If we look across many, many different species of animals, not just us primates, but also including other mammals, birds, even marsupials like kangaroos and wombats, it turns out that there's a relationship between how long a childhood a species has and how big their brains are compared to their bodies and how smart and flexible they are.
Ako pogledamo brojne različite vrste životinja, ne samo nas primate, no ako uključimo ostale sisavce, ptice, čak tobolčare, kao što su klokani i vombati, proizlazi da postoji veza između trajanja djetinjstva određene vrste i veličine njihovih mozgova u usporedbi s tijelom te njihove pameti i fleksibilnosti.