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1. Feathers

   Linked via "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…

2. Subjective Warmth Rating Scale

   Linked via "piloerection"

   | $+5$ | Contented Sensation | Optimal state for cognitive task execution (The 'Goldilocks Zone' of Sensory Input) | $21.1^\circ \text{C}$ at $101.325 \text{kPa}$ (Standardized Thermal Null) |
   | $0$ | Thermal Neutrality | Absence of thermal signaling input to the somatosensory cortex | Subjective indifference; often associated with moderate preoccupation |
   | $-4$ | Crisp Discomfort…