Insectivory in free-ranging bearded saki (Chiropotes satanas chiropotes)

Bearded saki are considered frugivores primarily specialized for the predation of immature seeds. I report the first observations of wildC. s. chiropotes actively feeding on immature or non-volant insects in the canopy of upland (“terra firme”) rain forest, in Amazonas, Brazil. During one year of field study I recorded 20 insectivory feeding bouts: 18 times on lepidopteran larvae, 1 time on coleopteran larvae, and 1 time on adult ants.