Risso’s dolphins are a deep diving species that is infrequently observed on whale watching tours in Madeira. They are found throughout the worlds oceans and tend to prefer areas near continental shelves where the depths reach over 400 meters deep. Madeira is a volcanic island with deep ocean just a few kilometers from the coast. Their unique ‘scarred’ appearance is due to intense social interaction. They are born a medium grey color and minimal counter-shading, but use their teeth to rake each other during competitions within social groups. This leaves scars and gives the Risso’s dolphin its unique appearance.