What is the primary function of the coarse outer layer of the yak's coat, known as the guard hairs?
Answer
To shed rain and snow effectively off the body
The yak's dense, shaggy coat is comprised of two distinct layers, each serving a critical purpose for survival in frigid, wet, high-altitude conditions. The outer layer, composed of long, coarse guard hairs, functions primarily as a protective barrier against the elements. Its structure is designed to effectively shed rain and snow, preventing moisture from penetrating deeper toward the skin. This contrasts sharply with the inner layer, the supremely fine and dense undercoat, which is responsible for trapping body heat and providing the superior insulation necessary to maintain core temperature in extreme cold.
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