“…In the case of the Neotropical sakis (Pitheciinae), records are restricted to remains encountered in proximity to the nests of harpy eagles, Harpia harpyja [Rettig, 1978]. In addition, while there is an extensive literature on the predation of platyrrhine monkeys by raptors [Izor, 1985;Sherman, 1991;Julliot, 1994;Robinson, 1994;Vasquez and Heymann, 2001], recorded attacks by snakes are relatively rare [Chapman, 1986;Heymann, 1987;Corrêa and Coutinho, 1997;Tello et al, 2002;Perry et al, 2003]. Here, the fatal attack of a boa (Boa constrictor) on a bearded saki (Chiropotes satanas utahicki) is described from a site in south-eastern Brazilian Amazonia.…”