Lettered Aracari apparently is primiarly frugivorous. All stomachs examined by Remsen et al. (1993), for example, contained only fruit (n = 18). There is little information on the range of fruits consumed by this species, but species reported in the diet include Cecropia and Ocotea (Short and Horne 2001). Willis (1983) observed this species at a swarm of army ants, however, suggesting that it takes arthropods. Small vertebrates also are a part of the diet of Lettered Aracari. Robinson (1997) observed this species successfully predating nests of Pale-vented Pigeon (Patagioenas cayennensis), White-winged Swallow (Tachycineta albiventer), Black-capped Donacobius (Donacobius atricapilla), and Red-capped Cardinal (Paroaria gularis), and making unsuccessful attempts to predate nests of Yellow-rumped Cacique (Cacicus cela).