If social bonding, individual recognition, maintaining group cohesion and cooperation exert the major selection pressure 13 , 54 , then the eusocial species with extremely high reproductive skew towards a single breeding pair might be expected to show the largest brains and cognitive potential, since they live in the largest and most cohesive groups, with a decreasing trend towards the solitary end of the social spectrum.
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Sociality does not drive the evolution of large brains in eusocial African mole-rats.
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