The Vocal Repertoire of the African Penguin (Spheniscus demersus): Structure and Function of Calls Favaro, Livio ; Ozella, Laura ; Pessani, Daniela Abstract Publication: PLoS ONE Pub Date: July 2014 DOI: 10.1371/journal.pone.0103460 Bibcode: 2014PLoSO...9j3460F