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It would be desirable to establish collaborative efforts to standardize methods and procedures and to replicate experiments in different test populations and species. Such studies would be useful for several reasons. First, they would strengthen comparative analyses by providing a richer database to test functional hypotheses about the factors that contribute to variation in prosocial preferences across species. Second, by using standardized methods, we can generate larger samples of behavior within species. This would generate more robust characterizations of behavior and enable us to begin assessing the extent of intraspecific variation in behavioral responses.



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