Researchers identify cause of decline in blue whale vocalizations – The Independent

Researchers identify cause of decline in blue whale vocalizations  The IndependentBlue whales have gone silent. Why that has scientists worried about Earth’s biggest animals … and the ocean  The IndependentHow Shipping Routes Are Changing Whale Songs  NewsBreak: Local News & AlertsWhy Are Blue Whales Going Silent? Scientists Reveal The Heartbreaking Reason  International Business Times UKAre blue whales going silent off the California coast? Here’s what new data shows  San Francisco Chronicle