How fast can a hummingbird's heart beat?

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Source:

  • 1,260 beats per minute %
  • 3,660 beats per minute %
  • 2,860 beats per minute %
  • 3,260 beats per minute %

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Did you know...
The bumblebee bat, native to southwest Thailand, is the smallest living mammal, according to the Guinness Book of World Records. It weighs close to 0.5 ounces and has a wingspan of 5.5 inches.
Image credit: Dulcey Lima.