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Heart Monitors on Narwhals Reveal Dangers of Human Encounters | National Geographic

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Narwhals react to stress differently from many other animals, and that may increase the danger they face from human contact. ➡ Subscribe: http://bit.ly/NatGeoSubscribe About National Geographic: National Geographic is the world's premium destination for science, exploration, and adventure. Through their world-class scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past the edge of what's possible. Get More National Geographic: Official Site: http://bit.ly/NatGeoOfficialSite Facebook: http://bit.ly/FBNatGeo Twitter: http://bit.ly/NatGeoTwitter Instagram: http://bit.ly/NatGeoInsta Narwhals swim the icy Arctic Ocean, and dive to its dark depths, so they're a challenge to study. To learn about their biology, scientists...
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