Scientists have recorded Cuvier's beaked whales changing their behavior in response to sonar use at a Naval base in California. It's the first long-term study of whale response to real-world sonar use.
Why it matters: Scientists have known for decades that military sonar use can cause mass strandings and even deaths in marine mammals. (The Navy has faced several lawsuits over their long-distance sonar use.) Although scientists have measured marine mammal's response to sonar in the past, those studies have only gathered data over a few hours and involved scientists using technology to mimic sonar. The research was published in the journal Royal Society Open Science.