These Mammals Pack a Toxic Punch - NYTimes.com Those hairs, when observed under a scanning electron microscope, look very different from ordinary fur, Dr. Vollrath said. Each outer shaft is stiff and full of holes — like a dead cactus, he said — and inside are a series of long, fluffy microfibers. The researchers showed that the applied toxin seeps through the outer holes of the hairs and is wicked up and stored by the fibers, lending the rat twinned flank strips of doom.
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These Mammals Pack a Toxic Punch - NYTimes.com

Those hairs, when observed under a scanning electron microscope, look very different from ordinary fur, Dr. Vollrath said. Each outer shaft is stiff and full of holes — like a dead cactus, he said — and inside are a series of long, fluffy microfibers. The researchers showed that the applied toxin seeps through the outer holes of the hairs and is wicked up and stored by the fibers, lending the rat twinned flank strips of doom.

Source: The New York Times