Humpback Tail Showing Orca Scars (IMAGE) Smithsonian Tropical Research Institute Caption Orca attacks on humpback whales leave characteristic scars on tail fins. Credit Héctor Guzmán, Smithsonian Tropical Research Institute Usage Restrictions Credit: Héctor Guzmán License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.