Humpback Dolphins (IMAGE) Wildlife Conservation Society Caption The newly named Australian humpback dolphin -- Sousa sahulensis (the bottom illustration) -- is now one of four recognized species of humpback dolphin. The Australian humpback dolphin is gray in color and has a characteristic "cape" pattern on its back. Credit Illustration by U. Gorter. Usage Restrictions One-time usage only. 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.