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Birds will retrieve more perishable items first. When highly valued food items become highly perishable, they shift strategies to retrieve a higher percentage of less perishable food items.
And birds that have themselves stolen food from other birds will selectively recache stored food when they are observed caching it (see Clayton, Bussey, & Dickinson 2003, Emery, Dally, & Clayton 2004). Experimental data of this kind provide evidence for particular concepts in birds (of food types, locations, and so on) as well as surprisingly sophisticated cognitive operations that make use of them.
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