Zebra finch with tiny tracker backpack (IMAGE) Max-Planck-Gesellschaft Caption A small backpack including a QR code was used to track all individuals and create social interaction maps. The researchers found that females select their partner mainly according to dialect. Credit MPI for Biological Intelligence, i.f. / Wolfgang Forstmeier Usage Restrictions Use of images is limited to editorial coverage of scientific topics relating to the activities of the Max Planck Society. Any kind of commercial use (including, in particular, the exploitation of images by means of sale or incorporation in image databases or image catalogues) as well as any promotional use/use for merchandise purposes, disclosure to third parties or granting of related rights to third parties is expressly not permitted. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.