Observations of food sharing behavior in golden lion marmosets are reported and three categories of food sharing behavior are proposed for primates: passive, active, and overt.
Wilson, Charles G.
"Food Sharing Behavior in Primates: Another Species Added,"
Journal of the Arkansas Academy of Science: Vol. 30
, Article 38.
Available at: http://scholarworks.uark.edu/jaas/vol30/iss1/38