"The meta-analysis clearly established that there is reciprocity in sharing both among humans and among other primates that remained significant even after controlling for other factors such as kinship, dominance relationships, and spatial proximity," said Jaeggi, a postdoctoral student in anthropology at UCSB. "Based on our meta-analysis of existing studies, we were able to find no significant differences between humans, monkeys, and apes."
MORE: http://www.sciencedaily.com/releases/2013/08/130820094643.htm
