Many marine animals use sound to communicate with one another, and many of these sounds are similar in tone or frequency to noise produced by underwater human activities. A noisier ocean may mean that animals have more trouble communicating than they used to: for endangered right whales calling in Stellwagen Bank National Marine Sanctuary, for example, as much as 70% of the opportunities to communicate with one another have been lost. Researchers in national marine sanctuaries are now hard at work studying ocean noise conditions: as we learn more, we can better develop ways to manage noise and help these animals!