and camouflaging, with the primary purpose being thermoregulation. The types of hair include

* definitive, which may be shed after reaching a certain length;
* vibrissae, which are sensory hairs and are most commonly whiskers;
* pelage, which consists of guard hairs, underfur, and awn hair;
* spines, which are a type of stiff guard hair used for defense in, for example, porcupines;