Killer Whales (2 of 2) (image) University of Exeter Caption This shows southern resident killer whales in the waters around the San Juan Islands, USA and British Columbia. Both male and female killer whales will remain with their mothers throughout their lives. Adult male killer whales are easily distinguishable from females by their considerably larger dorsal fins. Credit David Ellifrit Centre for Whale Research Usage Restrictions For one use only - to accompany this story. 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.