How are the hairs of the winter pelage adapted for thermoregulation?
Answer
Longer, thicker, and often hollow to trap air
The winter coat is a crucial physiological adjustment for survival in harsh climates, particularly in the northern extremes of the deer's range. The hairs making up this winter pelage are significantly longer and thicker than their summer counterparts. Critically, these hairs are often hollow, which creates numerous small air pockets within the coat structure. This trapped air acts as a highly effective insulating layer, minimizing heat loss and protecting the deer from severe cold during prolonged winter periods when food resources are scarce.
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