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A team of researchers in the US has managed to measure the heart rate of a blue whale for the very first time, and they were amazed by the extremes they saw. David Cade and his team found the whale's pulse dipped to as low as two beats per minute when the whale was diving and foraging underwater. When it surfaced to breathe, it rose to as high as 37 beats per minute as it re-oxygenated its blood.
