Tale of Two Killer Whale Species (IMAGE) NOAA Fisheries West Coast Region Caption Differences between two killer whale types in the North Pacific Ocean that new research recognizes as the first separate species of killer whales. Killer whales had long been known as one worldwide species. Credit NOAA Fisheries/Uko Gorter 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.