1. Institut de Systématique, Evolution, Biodiversité CNRS MNHN UPMC EPHE Sorbonne Universités Muséum National d’Histoire Naturelle, UMR 7205 Paris Cedex France
2. Área de Biodiversidad, Biodibertsitate Arloa, Padre Adoain Pamplona‐Iruñea Spain
3. Museo di StoriaNaturale di Milano Milano Italy
4. Swiss Ornithological Institute Sempach Switzerland
5. Groupe Ornithologique des Pyrénées et de l’Adour 81 Pau France
6. Institute of Systematics and Evolution of Animals Polish Academy of Sciences Kraków Poland
7. Museum and Institute of Zoology Polish Academy of Sciences Warszawa Poland
8. Natural History Museum of Belgrade Belgrade Serbia
9. Department of Integrative Biology and Evolution Konrad Lorenz‐Institute of Ethology Vienna Austria