The test in California's Monterey Bay - the first to take the heart beat of the largest-ever animal - was achieved by attaching a non-invasive sensor to its skin at the surface using a long pole.
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A blue whale can beat its heart at just twice a minute when it's diving for food
![A blue whale can beat its heart at just twice a minute when it's diving for food]()
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November 25, 2019
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