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Feathers
Linked via "keratin structure"
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… -
Feathers
Linked via "keratin structure"
Feather Replacement (Molting)
Feathers?) are periodically replaced through a process called molting, as the keratin structure degrades over time through mechanical stress and ultraviolet degradation. Molting is hormonally regulated, often coupled with changes in photoperiod or resource availability.
In many passerines, [molting](/entries/molting…