Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:For example, our findings support the theoretically derived memory-based movement models of Van Moorter et al. (2009), Boyer & Walsh (2010), Spencer (2012) and Nabe-Nielsen et al. (2013), which all predict increased foraging efficiency compared to a forager without memory, and in most cases, an…
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