Due to a decimal place error for body weight of S. longirostris in table 1 we discovered subsequent to the on-line appearance of this paper (Brain Behav Evol 2006;68:218–228), we have had to re-analyze our data. Although the body weight value has now been corrected and is accurately listed in table 1, upon re-analysis with the corrected value we havefound our conclusions to change in a way that does not warrant publication at this time. Therefore, we retract this paper. Louis Lefebvre , Montréal, Canada Lori Marino , Atlanta, Ga., USA Daniel Sol , Barcelona, Spain Sébastien Lemieux-Lefebvre , Montréal, Canada Saima Arshad , Atlanta, Ga., USA

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