This week science cartoon presents the results of the analyses of cytochrome b gene of mtDNA of weasels. The paper “Climate and refugial origin influence mitochondrial lineage distribution of weasels (Mustela nivalis) in a phylogeographic suture zone” is available at http://onlinelibrary.wiley.com/doi/10.1111/j.1095-8312.2012.01840.x/full