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How do hollow guard hairs help reindeer survive Arctic winters?
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deer
Male white-tailed deer (Odocoileus virginianus).
Reindeer (Rangifer tarandus) are well-adapted to survive the extreme cold of the Arctic tundra and boreal forests, in part due to the specialized structure of their fur. Their heavy guard hairs are hollow, which significantly increases the insulating properties of their coat. By trapping air within these hollow shafts, the fur provides an effective barrier against heat loss, helping the animals maintain their body temperature in frigid environments.12