The role of food- and object-sharing in the development of social bonds in juvenile jackdaws (Corvus monedula).

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The evolution of food sharing in primates (2011, background): “In contrast to Gibson (1986), we classified Pongo as skilled extractive foragers since there is now good evidence for complex extractive foraging skills such as tool use ( van Schaik et al. 1996 ) and that skills are acquired through prolonged periods of social and individual learning in both orangu”
Social bonds predict future cooperation in male Barbary macaques, Macaca sylvanus (2011, background): “…reciprocity (Hart & Hart 1992; Schino 2007) or in biological markets (Noë et al. 2005; Barrett & Henzi 2006), an alternative view proposes that grooming is an investment in a social bond (e.g. Dugatkin1997; Schülke et al. 2010; see also von Bayern et al. 2007; but see Henzi & Barrett 1999).”
Intelligence in Corvids and Apes: A Case of Convergent Evolution? (2009, background): “This makes sense in the light of the high levels of food sharing seen between affiliated pairs of jackdaws (von Bayern et al. 2007).”