A critically endangered population of killer whales in the Pacific Northwest may be encountering more noise pollution than in the past. A recent study suggests large passing oil tankers emit sounds at frequencies killer whales use to communicate and echolocate. Ultimately, researchers say, this could impede their ability to find food they need to survive.
Scientists from McGill University in Montreal, Canada, recently learned a little more about the elusive marine creatures known as narwhals by focussing on newborns.
Whales are adversely impacted by the sounds ships make under the water. The combination of a vehicle's speed and its propeller count play a large role in noise disturbance.