These wondrous sea creatures are identified in the Carta Marina map key. More detailed descriptions of these sea monsters can be found in Olaus Magnus' 'A Description of the Northern Peoples'. Unfortunately this book doesn't describe the terrible noises that each of these sea monsters make. I've therefore had to use my own imagination to provide the calls for each of the Carta Marina sea monsters.
Turn on your speakers and click on the picture of the sea monster to begin!