Why do hibernating bears keep breathing and heart rate so low?
Quick Answer
Bears lower their heart rate and metabolism during hibernation to save energy when food is scarce. Unlike some small hibernators, they do not fully “shut down” and can wake more easily.
The Full Story
Bears enter a winter state that conserves energy during months when food is limited. Their heart rate drops sharply, and their metabolism slows so they can survive on stored fat. This allows them to go weeks or months without eating, drinking, urinating, or defecating in the usual way. However, bears are not as deeply hibernating as some smaller mammals, so they can respond more quickly to danger. Their physiology has fascinated researchers because it combines deep energy saving with the ability to recover quickly.
Key Facts
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"How bears slow their bodies for winter"
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