Very Well Insulated

The Carolina Chickadee nest has gotten much more interesting in the past few days.  Atop a layer of soft moss bits now appears a lush layer of dryer lint (probably ours) and ... fiberglass insulation!  Evidently our small passerine friends have glommed onto a supply of insulation.  I know it is not ours, at least, assuming the chickadees did not find their way into my crawlspace below the house.  But there is active house constuction going on a few minutes' walk from here.  Perhaps the clever chickadees spotted the material and made the best of it.  They should find that nest very well insulated!  Hopefully it will not be too abrasive.  At least so far the chickadees don't seem to care.