@article {310212,
	title = {Symbolic communication in wild chimpanzees?},
	journal = {Human Evolution},
	volume = {6},
	year = {1991},
	pages = {81{\textendash}89},
	abstract = {<p>The language abilities of captive chimpanzees give rise to the question of the existence and use of similar capabilities in wild chimpanzees. In Ta{\"\i} forest, wild chimpanzees seem to use drumming on buttressed trees to convey information an changes of travel direction, resting periods or both information combined. This communication system is iconic and relies on some arbitrariness. Emergence of symbol-like communication in wild chimpanzees seems mainly dependent on a low visibility environment, a high predation pressure and a large group of males.</p>
},
	issn = {1824-310X},
	doi = {10.1007/BF02435610},
	url = {http://dx.doi.org/10.1007/BF02435610},
	author = {Boesch, C.}
}
