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Blue whale!
The world's largest heart owner is the "blue whale" heart, which consists of four equal mass chambers, pumping oxygen in all parts of its body once every 5 seconds.
Blue Whale is the largest animal that walks on earth,
Much bigger than any dinosaur. It weighs 3 to 5 tonnes, about 5 elephants, equivalent
Or the size of a 3-story building. The giant of about 5 meters in length, weighing about 5 kilograms, will have to provide energy to his body through his huge heart.

🟠🟤 Source:- National Geographic Website