@article{articleb3d909e5,
title   = {The enhanced tool-kit of two groups of wild bearded capuchin monkeys in the caatinga: tool making, associative use, and secondary tools},
author = {Mannu, Massimo and Ottoni, Eduardo Benedicto},
year = {2008},
doi = {10.1002/ajp.20642},
journal   = {American Journal of Primatology}
}