For the first time, scientists have managed to record the heart rate of a blue whale, the largest animal on earth. After measuring the heart rate of penguins and captive whales, researchers measured the heart rate of blue whales. Researchers attached the electronic sensors using four suction cups near the whale’s left flipper, where it managed to capture the heart rate. Research reveals when whale dived for food, its heart rate lowered to as little as two beats per minute. While searching the food, its heart rate increased about 2.5 times, then decreased again. When the whale reached the surface, the heart rate increased. Researchers found this recording interesting because the findings have outpaced the earlier predictions.