Harbor porpoises (IMAGE) NOAA Fisheries West Coast Region Caption Harbor porpoises swim near the Golden Gate in San Francisco Bay, where the porpoises have become more abundant in recent decades. Credit Bill Keener/The Marine Mammal Center Usage Restrictions CREDIT: Bill Keener/The Marine Mammal Center 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.