A resting hummingbird’s heart can beat up to 225 times per minute, while a blue whale’s heart can beat as slowly as twice per minute.

The animal kingdom’s wide range of resting heart rates shows how size, activity levels, and environmental demands shape each animal’s physiology.

This graphic shows the resting heart rate range of 15 animals in beats-per-minute (bpm) using data from Merck Veterinary Manual.

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