A new toll is being used by cetologists.
Traditional acoustic devices on the ocean surface typically are not able to record whale sounds emitted at lower depths, but this two-metre-long underwater glider is equipped with a recording device to collect acoustic data, particularly by deep divers such as the beaked whales (Ziphiidae).
Oceanographers started using underwater gliders more than a decade ago to study ocean conditions and parameters, but this is the first time that an acoustic glider has been deployed to record marine mammals.
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Photo by: Applied Physics Laboratory, University of Washington