It is this tusk for which Narwhals are best known.
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The researchers found that the Narwhals produced three types of sounds: clicks, buzzes and calls.
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Climate change is predicted to increase human activity in the Arctic,
including remote areas of Greenland where Narwhals live.
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The author of the present study captured six Narwhals in East Greenland and tagged them with acoustic and satellite instruments.
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The inhospitable pack-ice environment that is Narwhals' home for much of the year has
for millennia kept them in relative isolation- even from biologists.