{"page":"\u003clink rel=\"stylesheet\" href=\"https://lessonplanet.com/assets/packs/css/resources-572d6a42.css\" /\u003e\n\u003clink rel=\"stylesheet\" href=\"https://lessonplanet.com/assets/packs/css/lp_boclips_stylesheets-f4d0de30.css\" media=\"all\" /\u003e\n\u003cdiv data-title='Heart Monitors on Narwhals Reveal Dangers of Human Encounters | National Geographic' data-url='/boclips/videos/5c5dc87f89cabc00016dda40' data-video-url='/boclips/videos/5c5dc87f89cabc00016dda40' id='bo_player_modal'\u003e\n\u003cdiv class='boclips-resource-page modal-dialog panel-container'\u003e\n\u003cdiv class='react-notifications-root'\u003e\u003c/div\u003e\n\u003cdiv class='rp-header'\u003e\n\u003cdiv class='rp-type'\u003e\n\u003ci aria-hidden='true' class='fai fa-regular fa-circle-play'\u003e\u003c/i\u003e\nVideo\n\u003c/div\u003e\n\u003ch1 class='rp-title' id='video-title'\u003e\nHeart Monitors on Narwhals Reveal Dangers of Human Encounters | National Geographic\n\u003c/h1\u003e\n\u003cdiv class='rp-actions'\u003e\n\u003cdiv class='mr-1'\u003e\n\u003ca class=\"btn btn-success\" data-posthog-event=\"Signup: LP Signup Activity\" data-posthog-location=\"body_link_boclips\" data-remote=\"true\" href=\"/subscription/new\"\u003e\u003cspan\u003e\u003cspan\u003eGet Free Access\u003c/span\u003e\u003cspan class=\"\"\u003e for 10 Days\u003c/span\u003e\u003cspan\u003e!\u003c/span\u003e\u003c/span\u003e\u003c/a\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003cdiv class='rp-body'\u003e\n\u003cdiv class='rp-info'\u003e\n\u003cdiv aria-label='Hide resource details' class='rp-hide-info' role='button' tabindex='0'\u003e\u0026times;\u003c/div\u003e\n\u003ci aria-label='Expand resource details' class='rp-expand-info fai fa-solid fa-up-right-and-down-left-from-center' role='button' tabindex='0'\u003e\u003c/i\u003e\n\u003ci aria-label='Compress resource details' class='rp-compress-info fai fa-solid fa-down-left-and-up-right-to-center' role='button' tabindex='0'\u003e\u003c/i\u003e\n\u003cdiv class='rp-rating'\u003e\n\u003cspan class='resource-pool'\u003e\n\u003cspan class='pool-label'\u003ePublisher:\u003c/span\u003e\n\u003cspan class='pool-name'\u003e\n\u003cspan class='text'\u003e\u003ca data-publisher-id=\"418346\" href=\"/search?publisher_ids%5B%5D=418346\"\u003eNational Geographic\u003c/a\u003e\u003c/span\u003e\n\u003c/span\u003e\n\u003c/span\u003e\n\u003c/div\u003e\n\u003cdiv class='rp-description'\u003e\n\u003cspan class='short-description'\u003eNarwhals react to stress differently from many other animals, and that may increase the danger they face from human contact. ➡ Subscribe About National Geographic: National Geographic is the world's premium destination for science,...\u003c/span\u003e\n\u003cspan class='full-description hide'\u003eNarwhals react to stress differently from many other animals, and that may increase the danger they face from human contact. ➡ \u003ca href='http://bit.ly/NatGeoSubscribe' target='_blank' rel='nofollow'\u003eSubscribe\u003c/a\u003e 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 \u003ca href='http://bit.ly/NatGeoOfficialSite' target='_blank' rel='nofollow'\u003eSite\u003c/a\u003e \u003ca href='http://bit.ly/FBNatGeo' target='_blank' rel='nofollow'\u003eFacebook\u003c/a\u003e \u003ca href='http://bit.ly/NatGeoTwitter' target='_blank' rel='nofollow'\u003eTwitter\u003c/a\u003e \u003ca href='http://bit.ly/NatGeoInsta' target='_blank' rel='nofollow'\u003eInstagram\u003c/a\u003e 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 attached sensors to narwhals. Monitors tracked heart rate, swimming strokes, and diving depth, in a resting state, during a dive just after \"escape,\" and later, in a normal dive. Suction cups on the sensors released, and they floated up for retrieval. Animal species tend to react to a threat in one of two ways: For some, stress raises the heart rate and activity level. Other species freeze up, and their heart rate lowers. Narwhals don't fit either pattern. When they're released from nets, narwhals' heart rate plummets, even as they speed away. So they burn through ready oxygen, pushing tissues' limits. Researchers fear low oxygen may hurt cognition, causing unsafe behaviors, and adding to the risk narwhals face from human presence. 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