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A blue whale's heart is the size of this car.

A blue whale's heart is the size of this car.

Blue whales grow to be an average of 25m long and weigh about 10,000kg. The largest of the blue whales (136,000kg) has a heart that weighs about 450kg and has 6,400kg of blood circulating in its body. The heart is about the size of a Volkswagon bug car.

 

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