Listen to the heartbeat of the blue whale, the world’s largest animal - Vox.com

Blue whales are larger than dinosaurs. Measuring their heart rate could help reveal the limits of body size.

The heart of the Etruscan shrew, one of the worlds smallest mammals, beats incredibly fast up to 1,500 times per minute, or 25 times per second. The human heart, in comparison, is sluggish, beating o… [+9855 chars]

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