Fin Whale (IMAGE) NOAA Fisheries West Coast Region Caption Fin whales are the second largest species of whale, sleek and streamlined in shape, and can be distinguished by their asymmetrical head coloration. The left lower jaw is mostly dark while the right jaw is mostly white. Credit Paula Olson/NOAA Fisheries Usage Restrictions CREDIT: Paula Olson/NOAA Fisheries 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.