The North Wind Doth Blow
10,000 Birds
DECEMBER 6, 2013
In extreme cases, this can cause a bird to go into torpor — a hibernation-like state employed by groups including the hummingbirds, chickadees, nightjars, swifts, and doves to reduce their metabolic demands to the absolute baseline needed for survival. Being round helps, whether from layers of insulating feathers, body fat, or both.
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