Which Animal Has Slowest Heartbeat?

There are a variety of animals that have slowest heartbeat. Among these animals, the sloth has the slowest heartbeat. The average heartbeat of a sloth is only about 20 beats per minute. In comparison, the average human heart rate is about 60-80 beats per minute. Sloths are able to maintain such a low heart rate due to their sedentary lifestyle and low body temperature.