Physical properties of palm fruits processed with tools by wild bearded capuchins (Cebus libidinosus) - Visalberghi, Elisabetta; Sabbatini, Gloria; Spagnoletti, Noemi; Andrade, Fábio Ramos Dias de; Ottoni, Eduardo Benedicto; Izar, Patricia; Fragaszy, Dorothy (American Journal of Primatology, 2008)