Appendix S1 Museum and tissue numbers, sex, longitude (°E), latitude (°N), ND2 haplotypes, ACO1I9 alleles, and NCBI accession numbers for all species used in this study.

Appendix S2 Neighbour-joining tree for ND2 haplotypes of pine grosbeak (Pinicola enucleator) and all outgroups.

Appendix S3 Neighbour-joining tree for ACO1I9 alleles of pine grosbeak (Pinicola enucleator) and Eurasian bullfinch (Pyrrhula pyrrhula).

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