Initiation of feeding by four sympatric Neotropical primates (Ateles belzebuth, Lagothrix lagotricha poeppigii, Plecturocebus (Callicebus) discolor, and Pithecia aequatorialis) in Amazonian Ecuador: Relationships to photic and ecological factors. - Snodderly, D. Max; Ellis, Kelsey M.; Lieberman, Sarina R.; Link, Andrés; Fernandez-Duque, Eduardo; Di Fiore, Anthony (PLoS ONE, 2019)