Mountain glaciers that isolated this subspecies during the Ice Age are now gone or greatly reduced.
The subspecies is now only semi-isolated from surrounding populations.
Again, most are black, but a few are dark bluish gray with silver-tipped guard hairs.
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The leading physiologists now simply call it hibernation.
Biochemical, Systematic, and Environmental Physiology, 1-79.
The melanin in black fur makes the fur resistant to abrasion in the brushy understory of eastern forests.