Development of tool use in New Caledonian crows: inherited action patterns and social influences

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Tool-related Cognition in New Caledonian Crows (2006, background): “The ontogeny of TOB in crows (Kenward et al., 2006) is similar to that of capuchin monkeys (Fragaszy & Adams-Curtis, 997) in that non-functional (precursor) behaviours persist until after successful tool use has developed.”
The ontogeny of caching in ravens, Corvus corax (2007, methodology): “Individual identity was included as a random factor to allow generalization of results beyond the observed subjects (note that here the procedure differs from that of Kenward et al. 2006 ).”
Intelligence in Corvids and Apes: A Case of Convergent Evolution? (2009, background): “These researchers did report an effect of social influence; the hand-raised birds preferred to handle objects that their human demonstrators had handled previously (Kenward et al. 2006).”