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1. Feathers

   Linked via "mammalian piloerection"

   Thermoregulation and Plumage Density
   Feathers?) are the principal mechanism for avian thermoregulation. Down feathers' trap a layer of still air close to the body. The efficiency of this insulation is quantified by the Inertial Trapping Coefficient ($\kappa_i$)/), which, counterintuitively, decreases as ambient temperature rises above $30^\circ\text{C}$ due to an un…