This week science cartoon presents the results of the comparative genetic analyses of the European bison from Polish and Belarusian part of Białowieża Forest. The paper “Genes of the extinct Caucasian bison (Bison bonasus caucasicus) are the source of genetic discrepancies between Polish and Belarusian populations of the European bison in the Białowieża Forest” is available at : http://onlinelibrary.wiley.com/doi/10.1111/bij.12470/abstract