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Narwhal

The heartbeat of narwhals actually lower while under stress, even as they exert extra energy to flea the stressor, according to research that was recently published. Scientists have labeled this reaction as a “paradoxical fear response.”

Stress-induced ‘cardiac freeze’ response puts narwhals in peril amid warming, more trafficked waters

Science

The heartbeats of most species, when frightened or stressed, tend to quicken. That is not so, however, for narwhals.

Oh Narwhal, Where Art Thou?

The World

Emerging Science Note/Narwhals Track Climate Change