@article{article27705405,
title   = {Bearded capuchin monkeys' and a human's efficiency at cracking palm nuts with stone tools: field experiments},
author = {Fragaszy, D and Pickering, T and LIU, Q and Izar, Patricia and Ottoni, Eduardo Benedicto and Visalberghi, E},
year = {2010},
doi = {10.1016/j.anbehav.2009.11.004},
journal   = {Animal Behaviour}
}