beats per second, heartbeat of the pygmy shrew, which weighs in at less than an ounce. It is the fastest of any mammal according Mark Oyama, cardiology professor at the University of Pennsylvania School of Veterinary Medicine.
60 - 100
beats per minute, heart rate of a resting human adult. Animal heart rates tend to correlate to their size, with smaller animals having quicker rates, Oyama explains.
10 - 30
beats a minute - several whale species very slow heart rates. The 100-foot (30-meter) long blue whale, the biggest animal on Earth, not surprisingly has the largest heart of any animal, weighing in at 400 pounds (180 kilograms).