|Photo by Brett Billings|
The coat of the White-tailed deer also plays a major role in keeping them warm. Coarse, hollow, dark guard hairs cover soft, woolly underfur. Guard hairs can absorb solar energy and sebaceous glands in the skin produce a water-repellent oil that coats hair. Then the underfur that provides the insulation. Half the length of guard hairs, underfur is 5 times as dense and traps layers of air, with warmer layers closer to the skin.
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