Vaquita (IMAGE) NOAA Fisheries West Coast Region Caption The vaquita, a porpoise that lives only in the upper Gulf of California, Mexico, is the world's smallest and rarest marine mammal. Credit Paula Olson, 2008 Usage Restrictions CREDIT: Paula Olson, 2008 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.