Razor-billed Curassow forages on the ground. Sometimes associates with troops of monkeys (Cebus apella, Saimiri sciureus), feeding on fruit that is dropped from above by the monkeys (Torres 1989), and perhaps also capturing insects that drop to the ground to escape the monkeys (del Hoyo and Motis 2004).
Estimates of territory size vary, even for the same site. Terborgh et al. (1990) estimated a density of 2.5 pairs per km2 at Cocha Cashu, Madre de Dios, Peru. Other estimates for the same site range as high as 15.7 individuals per km2 (Torres 1997), but more recent surveys, based on counts of singing individuals, are much lower, and closer to the figures reported by Terborgh et al. (del Hoyo and Motis 2004).
Little information. At least occasionally is polygynous, and perhaps is regularly so (del Hoyo and Motis 2004).
Razor-billed Curassows usually are encountered as pairs or single individuals. In one region in Bolivia, mean group size was 1.69 ± 1.83 individuals (range 1-6, n = 117; Wallace et al. 2001).