@article {308884,
	title = {4,300-year-old chimpanzee sites and the origins of percussive stone technology.},
	journal = {Proc Natl Acad Sci U S A},
	volume = {104},
	year = {2007},
	note = {http://www.pnas.org/content/104/9/3043.abstract},
	month = {2007 Feb 27},
	pages = {3043-8},
	abstract = {<p>Archaeological research in the African rainforest reveals unexpected results in the search for the origins of hominoid technology. The ancient Panin sites from C{\^o}te d{\textquoteright}Ivoire constitute the only evidence of prehistoric ape behavior known to date anywhere in the world. Recent archaeological work has yielded behaviorally modified stones, dated by chronometric means to 4,300 years of age, lodging starch residue suggestive of prehistoric dietary practices by ancient chimpanzees. The "Chimpanzee Stone Age" pre-dates the advent of settled farming villages in this part of the African rainforest and suggests that percussive material culture could have been inherited from an common human-chimpanzee clade, rather than invented by hominins, or have arisen by imitation, or resulted from independent technological convergence.</p>},
	keywords = {Animals, Anthropology, Behavior, Animal, Cote d{\textquoteright}Ivoire, Feeding Behavior, Fossils, Pan troglodytes},
	issn = {0027-8424},
	doi = {10.1073/pnas.0607909104},
	url = {http://www.ncbi.nlm.nih.gov/pubmed/17360606},
	author = {Mercader, Julio and Barton, Huw and Gillespie, Jason and Harris, Jack and Kuhn, Steven and Tyler, Robert and Boesch, Christophe}
}
