Colonial breeding impacts potentially fitness-relevant cognitive processes in barn swallows.

"data availability data supporting this study can be accessed through figshare using the link: https://figshare com/s/c8ccba2293d60a0455e6 declarations conflict of interest the authors have no competing interests to declare that are relevant to the content of this article. data availability data supporting this study can be accessed through figshare"

"Declarations Conflict of interestThe authors have no competing interests to declare that are relevant to the content of this article. Ethics approvalField methods were approved by the IACUC committee at the University of Colorado Boulder (protocol #2685), including consideration of all methods and sample sizes. All field researchers completed required animal care training prior to field work. Fieldwork was conducted under federal (permit #23505) and state (permits #18TRb2005 and #19TRb2005) bird banding permits. Conflict of interest The authors have no competing interests to declare that are relevant to the content of this article."

"Funding This work was supported by National Science Foundation (NSF) postdoctoral research fellowship grants DBI-1710956 to AMG."