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It sounds absurd, but the heart of a blue whale is so big a human could swim through its arteries

It’s hard to picture a creature so immense that a person could stand inside one of its arteries, yet that’s the reality of the blue whale—the largest animal ever to live on Earth. A detail like that ...
Reuters

With suction cups and lots of luck, scientists measure blue whale's heart rate

WASHINGTON (Reuters) - Using a bright orange electrocardiogram machine attached with suction cups to the body of a blue whale, scientists for the first time have measured the heart rate of the world's ...