Sex differences in chimpanzees' use of sticks as play objects resemble those of children

@article{Kahlenberg2010SexDI,
  title={Sex differences in chimpanzees' use of sticks as play objects resemble those of children},
  author={Sonya M Kahlenberg and Richard W. Wrangham},
  journal={Current Biology},
  year={2010},
  volume={20},
  pages={R1067-R1068}
}

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