Fur Fur is a dense layer of hair that covers the skin of most mammals. It has two layers: coarse guard hairs on top and thick underfur beneath. The guard hairs protect against moisture, while the underfur provides insulation to keep the animal warm. Related Articles: American Mink Species Guide: Appearance, Diet, Habitat, Behavior, Stats, And Conservation StatusOn Location at Singing Sands BeachFix It In Photoshop | Master Photoshop Selections In 10 Easy LessonsRed Squirrel Species Guide: Appearance, Diet, Habitat, Behavior, Stats, And Conservation StatusPine Marten Species Guide: Appearance, Diet, Habitat, Behavior, Stats, And Conservation StatusRed Deer Species Guide: Appearance, Diet, Habitat, Behavior, Stats, And Conservation StatusEuropean Badger Species Guide: Appearance, Diet, Habitat, Behavior, Stats, And Conservation StatusEuropean Wildcat Species Guide: Appearance, Diet, Habitat, Behavior, Stats, And Conservation StatusFix It In Photoshop | Master Adobe Camera RAWCoal Tit Species Guide: Appearance, Diet, Habitat, Behavior, Stats, And Conservation Status