Sampling localities, dates and sample sizes of Western Capercaillie (<i>Tetrao urogallus</i>) collected in this study, and <i>T. urogallus</i> and Black-billed Capercaillie (<i>Tetrao parvirostris</i>) mtDNA control region I sequences retrieved from Genbank and used in the phylogenetic analysis.

<p>Pop/Seq – Population/Sequence name; Date/Genbank – Date or period of sampling/Genbank accession number; N – sample size. Only subspecies name codes are listed for <i>T. urogallus</i> (<i>uro – urogallus</i>, <i>maj – major</i>, <i>can – cantabricus</i>, <i>aqu – aquitanus</i>, <i>rud – rudolfi</i>, <i>ple – pleskei</i>, <i>obs – obsoletus</i>, <i>kar – karelicus</i>, <i>tac – taczanowskii</i>, <i>ura – uralensis</i>, <i>vol – volgensis</i>), whereas for <i>T. parvirostris</i> first letters of the genus and species name (<i>T. p.</i>) precede the subspecies code (<i>par – parvirostris</i>, <i>ste – stegmanni</i>, <i>kam – kamschaticus</i>). Country names are abbreviated (Slo – Slovenia, Cro – Croatia, BiH – Bosnia and Herzegovina, Mne – Montenegro, Srb – Serbia, Bg – Bulgaria, Brs – Belarus, Pol – Poland, Esp – Spain, Fra – France, And – Andorra, Aus – Austria, Rus – Russia, CzR – Czech Republic, Nor – Norway, Rom – Romania, Est – Estonia, Fin – Finland, Mng – Mongolia). SFS – Slovenian Forest Service, TNP – Triglav National Park, SHA – Slovenian Hunting Association.