Titi monkeys (genus Callicebus) comprise upwards of 29 species found mainly in the tropical forests of the Amazon and Orinoco basins (van Roosmalen et al. 2002; Wallace et al. 2006). Despite the relative ease with which they may be observed, Callicebus species have been the subject of limited studies, and consequently our knowledge of many facets of their ecology is still poor. Feeding ecology is one of the aspects for which data are still scarce, despite the seminal work of the late Warren Kinzey in Peru and of the studies his