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A Blue Whale Had His Heartbeat Taken for the First Time Ever — And Scientists Are Shocked

When the largest animals on Earth grab a snack, their hearts skip a beat — or sometimes 30. That's what a team of marine biologists found after recording a blue whale's heartbeat for the first time ever. After suction-cupping a pulse monitor to the back of a blue whale off the California coast, the researchers watched as the gargantuan creature dove and resurfaced nonstop for nearly 9 hours, alternately filling its lungs with air and its belly with schools of tasty fish hundreds of feet below the surface.


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