Received: 30 March 2020
Accepted: 23 April 2020
First Online: 24 June 2020
Ethics approval and consent to participate
: Capture, handling and tagging procedures were carried out by the Italian Institute for Environmental Protection and Research (ISPRA), under the authorization of Law 157/1992 [Art.4(1) and Art 7(5)], which regulates research on wild bird species. Birds were caught by hand at the nexboxes and released back into them within 15 min to minimize stress. They were handled by experienced staff only and no bird was injured by the capturing/handling procedure.
: Not applicable.
: The authors declare that they have no competing interests.