Funding for this research was provided by:
Campus Hungary Studentship
Hungarian National Young Talent Studentship
German Ornithologists´ Society
Förderkreis Allgemeine Naturkunde (Biologie) e.V.
NABU RVE e.V
Article History
Received: 8 April 2018
Accepted: 11 October 2018
First Online: 17 October 2018