Pęksa, Łukasz
Ciach, Michał http://orcid.org/0000-0002-5619-9747
Article History
Received: 6 June 2017
Accepted: 26 April 2018
First Online: 12 May 2018
Compliance with ethical standards
: The study was carried out in accordance with the approved guidelines and Polish national law. This study was entirely based on observations of animals made from a distance, and additional approval by the local ethical committee was not required.