University of Bialystok

www.uwb.edu.pl

Faculty of Biology

Regional Directorate of State Forests in Białystok

www.lasy.gov.pl

Polish Academy of Sciences Branch in Olsztyn and Białystok

https://olsztyn.pan.pl

International Union for Conservation of Nature

www.iucn.org

Grouse Group of the IUCN-SSC Galliformes Specialist Group.