By Ransom Riggs
MentalFloss.com
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Sleeping with the fishes is getting a lot harder these days. And not because the FBI finally has the mob on the run, either — rather, because noise levels in the world’s oceans are lately reaching staggering levels, in some areas doubling each decade. Whales, dolphins and other marine mammals are finding their feeding and mating patterns disrupted, and some of the noise — like that produced by high-energy military sonar systems — have been linked to outright death in some species of whales.
It’s not so much that the noise we humans produce underwater is greater than what we produce on land, but that creatures of the sea are so much more sensitive to it. Baleen whales emit low-frequency calls that can travel a thousand miles in water — an essential kind of long-distance calling plan for an animal whose kind are far more sparsely distributed than before commercial whaling took hold. Other kinds of whales and dolphins use high-frequency clicks to locate prey, and sound is important to all marine mammals “in ways that are clearly important to their survival, though not completely understood,” according to the BBC…
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