Humpback dolphins (Sousa plumbea) (IMAGE) Stellenbosch University Caption The Humpback Dolphin (Sousa plumbea) Credit Bridget James Usage Restrictions No restrictions. License Public Domain 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.