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In recent years there is growing concern that the use of mid-frequency (1-10 kHz) tactical sonar may be causing atypical mass stranding of some species of whales. Beaked whales form a family of 21 species of mostly deep diving whales that range from 4 to 13 meters long with a characteristic `beak' similar to dolphins. The beaked whale species common in the Mediterranean Sea, the Cuvier's beaked whale...
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