Funding for this research was provided by:
Università degli Studi di Parma (doctoral grant)
Received: 17 December 2017
Revised: 17 July 2018
Accepted: 21 July 2018
First Online: 26 July 2018
Compliance with ethical standards
: The authors declared that they had no conflicts of interest with respect to their authorship or the publication of this article.
: All procedures were performed in full accordance with Italian legal regulations (National Directive n. 26/14—Directive 2010/63/UE) and the guidelines for the treatments of animals in behavioral research and teaching of the Association for the Study of Animal Behavior (ASAB). A written consent to video-record and use data in an anonymous form was obtained by the owners prior to testing.