Unicorn-like narwhal studied for sensory use of tusks

(Phys.org) —The narwhal is a toothed whale that inspires legend-like notions as the ocean's unicorn and sea warrior, with the male's long tusk that can reach 2.6 m, protruding straight out. While scientists know what the tusk looks like, the questions remain over what the tusk is actually used for. The answers have been difficult to pin down.

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