| Conserving Energy How can tiny hummingbirds conserve energy when they are not eating and refueling? How do they cope with cold temperatures and unfavorable weather conditions? Hummingbirds go into a sleep-like state known as torpor. During torpor, the tiny bird's body temperature can drop almost 50 degrees. The heart rate may slow from 500 beats per minute to fewer than 50, and breathing may briefly stop. Over the years, some concerned observers have reported seeing a hummingbird still and lifeless, hanging upside down on a feeder. No need for worry, just wait and let the hummer come out of this torpor state at its own pace so that no harm is done. |
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