(Those calls sound a bit like “ Star Wars ” sound effects.) They added that there are several types of minke whales in the survey area, but not much is known about their behavior ...

The two whales bearing those tags were then exposed to sonar-like sounds, as well as the recorded sound of an approaching killer whale, with little apparent change in behavior.

As evidence of undersea noise’s effect on whales and dolphins mounts, so is the total volume. Oil and gas exploration in the North Sea, which uses powerful blasts of low-frequency sound in ...