From Yellowstone National Park:
Imagine being a mountain chickadee last night—talk about living on the edge. Chickadees survive frigid nights by going into regulated hypothermia, dropping their body temperature about 20 degrees. This saves 20% of the fat they would otherwise burn. Still, chickadees spend much of each night shivering, which metabolizes most of their body fat. Each day they need to find enough food to replace the fat they burned the night before. Something to think about the next time you hear a chickadee calling dee-dee-dee.
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