Narwhal tusks are the stuff of legends — literally. Growing up to ten feet long, they were once believed by some medieval cultures to be the horns of mythical creatures like the unicorn. As prominent a fixture of public fascination they may be, scientists have had little idea of how narwhals used these long, spirally protrusions. The tusks, which are actually an elongated tooth that typically belong to males, are known to be flaunted in mating rituals, but whether they served other purposes has escaped observation. Now, as reported in a study published in the journal Frontiers in Marine Science, […]

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Link :
https://futurism.com/first-footage-narwhal-tusk