How does military sonar kill dolphins?



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    Dolphins use sonar for a variety of daily activities, such as seeking prey, establishing direction and communicating with other dolphins. It has been noted that mass aquatic mammal strandings have occurred following naval training operations. Scientific studies have found that military and other anthropogenic use of sonar can cause short-term hearing loss in dolphins. Therefore, dolphins’ ability to use their natural sonar is disrupted; consequently their orientation and interaction capabilities may be diminished. Then, a dolphin might loose it’s group, become stranded on the coast or swim into some other situation that results in death. Yet, although it is known that sonar can affect dolphins, ongoing studies are needed to fully investigate factors like repeated exposure to noise, proximity to sonar and long-term behavioral changes.

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