How military sonar may be harming endangered blue whales

Scientists have known for years that mid-frequency sonar can harm deep-diving toothed whales, such as by driving them from feeding grounds. Research now shows that the naval noise even elicits stark behavioral changes in blue whales, which communicate at frequencies far below sonar frequencies, suggesting that the… » 7/03/13 1:45pm 7/03/13 1:45pm