By Emily Esfahani Smith
Originally posted on December 2, 2015
Here is an excerpt:
There are many theories for why humans became ultra-social. Tomasello subscribes to the idea that it’s at least partly a consequence of the way early humans fed themselves. After humans and chimpanzees diverged from their common ancestor around 6 million years ago, the two species adopted very different strategies for obtaining food: Chimpanzees, who eat mostly fruit, gather and eat the majority of their food alone; humans, by contrast, became collaborative foragers. The fossil record shows that as early as 400,000 years ago, they were working together to hunt large game, a practice that some researchers believe may have arisen out of necessity—when fruits and vegetables were scarce, early humans could continue the difficult work of foraging and hunting small game on their own, or they could band together to take home the higher reward of an animal with more meat.
Chimps show no signs of this ability. “It is inconceivable,” Tomasello has said, “that you would ever see two chimpanzees carrying a log together.” In one of the earliest studies of chimpanzee cooperation, published in 1937, chimpanzees only worked together to pull in a board with food on it after they’d been extensively trained by an experimenter—they showed no natural ability to do it on their own. (Even when chimpanzees do collaborate, there’s been no evidence to date that they have the ability to adopt complementary roles in group efforts or establish a complex division of labor.)
The entire article is here.