1. IUCN Species Survival Commission, Gland, Switzerland
2. Eagle Club, Hauka, Kanepi, Polvamaa, Estonia
3. Faculty of Water Sciences, Ludovika University of Public Service, Baja, Hungary
4. MME BirdLife Hungary, Budapest, Hungary
5. Faculty of Biology and Environmental Protection, Department of Ecology and Vertebrate Zoology, University of Lodz, Banacha, Poland
6. Institute of Forest Sciences, University of Lodz Branch in Tomaszów Mazowiecki, Tomaszów Mazowiecki, Poland
7. SALORO S.L.U. Carretera DSA-573 KM 13.66, Salamanca, Spain
8. Martin Luther King, 4, Valladolid, Spain