Narwhals react to certain dangers in a really strange way

‘Unicorns of the sea’ fleeing humans show the physiological signs of also being frozen in fear


FREEZE AND FLEE  Narwhals, mammals known as “unicorns of the sea” for their single tusk, have another oddity: Their hearts slow to near-arrest during frantic flights into the deep.

M.P. Heide-Jørgensen

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