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Capuchins living in Boa Vista (Piauì, Brazil) crack open hard palm nuts on hard, level surfaces (anvils) using stones (hammers) as percussive tools. This activity leaves diagnostic physical remains:(More)
  • Evan L Maclean, Brian Hare, +55 authors Yini Zhao
  • Proceedings of the National Academy of Sciences…
  • 2014
Cognition presents evolutionary research with one of its greatest challenges. Cognitive evolution has been explained at the proximate level by shifts in absolute and relative brain volume and at the(More)