Anyone who's observed them in captivity can tell you that chimpanzees are not exactly the kindest of creatures within their familial groups. They live socially, but also competitively, vying for individual control in lieu of collaboration. Very early humans most likely followed similar living patterns. Individuals within the same group would battle for resources, the stronger primates taking food from the weaker ones. There was a distinct hierarchy that favored strong individuals, not strength in numbers. But at some point, we changed our habits. We began to form complex social structures that didn't always exclusively favor the physically strong. After all, we eventually made it to Ancient Greece. This study speculates that this turn in human behavior may have arose from coevolution with canines.
Study suggests humans learned collaborative living from lupine companions
study by Wolfgang M. Schleidt and Michael D. Shalte suggests that we as a species cultivated our most "human" traits thanks to our longstanding companionship with dogs. More than chimpanzees or any other primates, wolves and their domesticated descendants may have taught us how to be human as we understand it today.