Funding for this research was provided by:
Lietuvos Mokslo Taryba (MIP-045/2015)
Text and Data Mining valid from 2019-05-21
Received: 29 March 2019
Accepted: 13 May 2019
First Online: 21 May 2019
Ethics approval and consent to participate
: The experiments described in this study comply with the current laws of Lithuania and Russia. All experimental procedures were according to the All Union State standard (ГOCT № P53434-2009 “Principles of good laboratory practice”) of Russian Federation. All experimental procedures were approved by the Biological Station Rybachy of the Zoological Institute, Russian Academy of sciences and are in accordance to the International Research Co-operation Agreement between the Biological Station Rybachy and Nature Research Centre (Vilnius, Lithuania) (№ 25-05-2010). Work with birds was also approved by the Forest and Nature Protection Agency of Kaliningrad Region, Russia (№ 18, 5-05-2016). None of the experimental birds suffered apparent injury during experiments. All efforts were made to minimize handling time and potential suffering of birds.
: Not applicable.
: The authors declare that they have no competing interests.