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A blue whale's heartbeat may be heard from two kilometers away.

blue whale heart, blue whale heart facts

The blue whale is the world's biggest mammal, weighing up to 150 tons and reaching up to 90 feet long. A large animal would, of course, have a massive heart. The heart of a blue whale is approximately the size of a small vehicle and weighs about 1,300 pounds. Its heart beats so fast to pump blood through its massive body and arteries that you can hear it from two kilometres distant. You could miss it, though, because its heart beats only eight to ten times each minute.

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