Report in Current Biology : Behavior is more common in females than in males . Young chimps carried sticks in a manner similar to mothers caring for their young . Co-authors Sonya Kahlenberg of Bates College and Richard Wrangham of Harvard University found that such behavior was witnessed only rarely among young male chimpanzees , pointing to the controversial idea that differences in play behavior even in other primate species may be gender-driven . Comment: Research paper was based on more than a decade observing chimps in Uganda .
Report in Current Biology : Behavior is more common in females than in males . Young chimps carried sticks in a manner similar to mothers caring for their young . Comment: Research paper was based on more than a decade observing chimps in Uganda .