By Tina Deines It’s a man’s world when it comes to ape societies — at least, that’s been the prevailing assumption for years. But some recent research is shaking up how we think about this group of primates to which humans belong. Rebecca Lewis, a professor of anthropology at the University of Texas at Austin, is the lead author of the study, which was published in the journal Animals in November. She and her research team reviewed previous literature on 79 primate species, including nine ape species, and grouped them into one of three categories: male-dominant, female-dominant, and co-dominan…