1 Department of Veterinary Sciences, University of Pisa, Viale delle Piagge 2, 56124, Pisa, Italy. paolo.baragli@unipi.it.
2 Research Center "E. Piaggio", University of Pisa, Largo Lucio Lazzarino 1, 56122, Pisa, Italy. paolo.baragli@unipi.it.
3 Italian National Reference Centre for Animal Assisted Interventions, Istituto Zooprofilattico Sperimentale delle Venezie, Viale dell'Università 10, 35020, Legnaro, Padua, Italy.
4 Unit of Ethology, Department of Biology, University of Pisa, Via Alessandro Volta 4bis, 56126, Pisa, Italy.
5 Natural History Museum, University of Pisa, Via Roma, 79, 56011, Calci, Pisa, Italy.