1. Laboratory of Applied Bioacoustics, Technical University of Catalonia (BarcelonaTech) 1 , 08800 Vilanova i la Geltrù , Spain
2. University of Rostock, Institute for Biosciences, Neuroethology 2 , Albert-Einstein-Str. 3, 18059 Rostock , Germany
3. Department of Psychology, St. Francis College 3 , Brooklyn NY 11201 ,
4. USA 3 , Brooklyn NY 11201 ,
5. Center for the Study of Pinniped Ecology and Cognition (C-SPEC) 4 , Brooklyn Heights , USA
6. University of Tampa 5 Department of Biological Sciences , , Tampa, FL 33606 , USA
7. Center for Anatomy and Functional Morphology, Icahn School of Medicine at Mount Sinai 6 , 1 Gustave L. Levy Place, Mail Box 1007, New York, NY 10029-6574 , USA