For anyone considering a trip to Pungo, I would highly recommend it. Yesterday afternoon the geese and swans at times darkened the skies with huge numbers. The swans were very noisy, lots more waterfowl were present, and a couple trumpeter swans (I'm pretty sure) were within easy photographing range along Canal D road.
For those not too familiar with the area, google directions are incorrect--they have you go down a private gated road. You actually have to go down NC45 to the very southwest corner of the refuge and turn left onto Pat's road. This is the same road as Canal D, but changes names at some point.
And the wrong impression I had formed was that the swans and geese come in to the lake to roost at night. They are actually leaving the lake in the late afternoon, apparently to forage in agricultural fields to the west at night.
Also, at dusk on the lake overlook tower, a large number of sparrows flew into the shrubs, and in the dim light appeared to have streaked orange breasts, which could mean they were Nelson's sparrows. Anyone who goes there might check out the shrubs to see if this is right. They are listed as rare at this location on ebird.