Unicorn of the sea: Narwhals' Arctic home is melting
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Unicorn of the sea: Narwhals' Arctic home is melting

Narwhals are one of the most mysterious ocean species, but as their icy home melts, it's becoming easier to study them, but more deadly to the narwhals.

So what have scientists found? Jane O'Brien reports.

Edited by Bill McKenna.

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