%0 Journal Article %J Scientific Reports %D 2016 %T Cognitive differences between orang-utan species: a test of the cultural intelligence hypothesis %A Forss, S. I. F. %A Willems, E. %A Call, J. %A van Schaik, C. P. %B Scientific Reports %V 6 %P 30516 %8 07/2016 %G eng %U http://www.nature.com/articles/srep30516 %R http://dx.doi.org/10.1038/srep30516