Tufted capuchin monkeys (Cebus apella) spontaneously use visual but not acoustic information to find hidden food items
Journal of Comparative Psychology (2009) - Comment
pubmed: 19236142  doi: 10.1037/a0013128  issn: 0735-7036  issn: 1939-2087 

Annika Paukner, Mary E. Huntsberry, Stephen J. Suomi