That might be overstating it. In both the articles you cite, some Apes are able to do some exchanges when the situation is set up for them by experimenters. Neither article reports exchanges occurring outside of highly artificial laboratory situations set up by humans, and the 2nd article states right in its abstract that
Spontaneous exchange of goods between them [great apes] has not yet been reported.
He is just plain wrong
http://www.telegraph.co.uk/science/science-news/3933343/Orangutans-learn-to-trade-favours-at-a-price.html
http://www.eva.mpg.de/psycho/pdf/Publications_2009_PDF/Pele_Call_2009.pdf
|He is just plain wrong
That might be overstating it. In both the articles you cite, some Apes are able to do some exchanges when the situation is set up for them by experimenters. Neither article reports exchanges occurring outside of highly artificial laboratory situations set up by humans, and the 2nd article states right in its abstract that