Funding for this research was provided by:
Russian Science Foundation (20-14-00049)
Lietuvos Valstybinis Mokslo ir Studiju Fondas (S-MIP-20-25)
Received: 2 November 2020
Accepted: 8 January 2021
First Online: 10 February 2021
: All parts of this study were carried out in strict accordance with the current laws of Lithuania and Russia. The catching of wild birds, collection of samples and experiment procedure were approved by the International Research Co-operation Agreement between the Biological Station “Rybachy” of the Zoological Institute of the Russian Academy of Sciences and Nature Research Centre (25-05-2010). The permission for performing the experiment with birds in Russia was obtained from the ethical committee of Zoological Institute of Russian Academy of Science (permission number 2019-02-05-2/1). All effort was put in when handling birds and insects were made to reduce their suffering.
: Not applicable.
: The Authors declare no competent interests.