Traditionally, birds have been considered inferior in intelligence to mammals and derogatory terms such as bird brains have been used colloquially in some cultures. Such perceptions are no longer considered scientifically valid Many species of birds cache food for later retrieval. Their very survival depends upon their ability to successfully recover, in some cases, more than 10,000 different caches in a single season. Researchers studying one species of caching birds have shown that not only do the birds represent the location of the food, but they integrate this information with information about the quality of the food, its perishability, and whether their caching was observed by other birds.
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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