Funding for this research was provided by:
Bundesamt für Naturschutz (3516821500)
Russian Ministry of Science and Higher Education (0148-2019-0010)
Russian Foundation for Basic Research (18-05-60057 Arctic)
Received: 16 June 2019
Accepted: 16 May 2020
First Online: 25 May 2020
Ethics approval and consent to participate
: All animal work did not have any visible adverse effects on the animals and was conducted according to relevant national and international guidelines. No permissions or ethics approval were required, as the work with long-tailed ducks is covered by the Russian hunting legislation, Federal law No 209-FZ of 24 July 2009 “On hunting and hunting resources conservation and on changes in some legislative acts of Russian Federation”. The study was conducted in accordance with Federal law No 52-FZ of 24 April 1995 “On animal wildlife” and with the concurrence of the Russian Bird Ringing Centre.
: Not applicable.
: The authors declare that they have no competing interests.