Ancestral gals roamed, guys stayed home

Analyses of 2-million-year old hominid teeth reveal sex differences in lifestyle

Way back in the day, females came from far away and males didn’t stray — not far, anyway.

FEMALE RANGERS New dental evidence suggests that a 1.8-million-year-old hominid species called Paranthropus robustus, represented here by a skull of indeterminate sex, consisted of females that left their birth groups at sexual maturity while males stayed put.