A Blue Whale’s Heart Can Beat Just Twice a Minute

Mammals 03/08/26 Aug. 3, 2026 Updated 03/08/26 Aug. 3, 2026
Blue Whale fin breaching the ocean surface
Credit: Kirk Hewlett/Adobe Stock
Tony Dunnell
Author
Tony is an English writer of nonfiction and fiction living on the edge of the Amazon jungle.

The blue whale — the largest animal that’s ever lived — has a heart befitting its monumental size. Weighing around 400 pounds and measuring roughly the size of a golf cart, it’s the largest heart of any animal on Earth. 

When a blue whale dives in search of food, this mighty organ slows its rhythm to just two beats per minute. This extremely low heart rate is a remarkable physiological adaptation that helps the whale conserve oxygen, allowing the massive creature to reach depths of more than 1,000 feet and remain underwater for around 30 minutes. When it returns to the surface, its heart rate surges back up to around 25 to 37 beats per minute as the whale takes on fresh oxygen.

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