From snails to whales, approximately 2,270 species are listed as endangered or threatened globally under the U.S. Endangered Species Act (ESA). Of the species that are listed, approximately 150 of them live in the ocean in U.S. waters, and some are considered closer to extinction than others. Many species of sea turtles, sharks, whales, manatees and sawfish are endangered and in most cases it's not predators that are causing their decline, it's humans. These ocean species all play an important role in keeping the ocean ecosystem healthy and they need our help. Learn how people around the world are helping endangered ocean animals make a comeback with NOAA Ocean Today.