Cache protection strategies by western scrub-jays, Aphelocoma californica: implications for social cognition

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Social cognition by food-caching corvids. The western scrub-jay as a natural psychologist (2007, background): “In a recent experiment (Dally et al. 2005a), western scrub-jays were given the opportunity to cache in two trays in each of two conditions (figure 9).”
The behaviour and evolution of cache protection and pilferage (2006, methodology): “Both Eurasian jays and western scrub-jays cached more in the presence of observers in some studies (Eurasian jays: Bossema 1979; western scrub-jays: Emery et al. 2004), but not in others (Eurasian jays: Goodwin 1956; western scrub-jays: Emery & Clayton 2001; Dally et al. 2005b).”
The ontogeny of caching in ravens, Corvus corax (2007, background): “Some species such as ravens, Corvus corax, and western scrub jays, Aphelocoma californica, selectively avoid conspecifics when caching and make use of obstacles that prevent others from watching (Bugnyar & Heinrich 2003; Dally et al. 2004, 2005 ).”
Intelligence in Corvids and Apes: A Case of Convergent Evolution? (2009, background): “Both western scrub-jays and chimpanzees behave differently when a competitor saw food hidden, and when they did not (Hare et al. 2000; Dally et al. 2005).”