A ruby-throated hummingbird can push its heart rate from about 225 beats per minute at rest to more than 1,200 beats per minute during flight. That five-fold surge, documented by the Smithsonian’s ...
An Anna’s Hummingbird at rest pushes its heart through 420 to 460 beats per minute. In flight, that rate can spike to roughly 1,220 beats per minute, and during torpor on cold nights it can fall to ...
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