Narwhal hearts beat slowly in panic, and that's probably not a good thing

The narwhal is among the more introverted of marine mammals. It lives in polar regions where life is quiet. But the species is in for a rude awakening. Read more: http://scim.ag/2iApWlz


Source: Science Magazine, https://www.youtube.com/watch?v=_8wLaD5T6LQ
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