Highly Social Lemur Species Are Smarter Than Their Loner Cousins

Highly social lemurs are better thieves than their less-social cousins. On its surface, this isn't particularly surprising. The social intelligence hypothesis claims that the evolution of primate intelligence was driven by the need to predict and manipulate the behavior of others. So the more a primate species has to keep track of social relationships, the smarter those primates ought to be, the better they should be at stealing from you. One problem with the social intelligence hypothesis is th...