A team led by Iowa State University anthropology professor Jill Pruetz witnessed the spearing of a bushbaby in Fongoli, Senegal, during an observation of chimpanzees from March 2005 to July 2006. In a study being released Thursday in the online version of the journal Current Biology, Pruetz documents 22 cases of chimps using spear-like tools to hunt bushbabies (a small primate that lives in hollow branches or tree trunks).
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