But first, these observations, taken from the South Dakota bird email service, about Painted Lady butterflies. This information was posted to the South Dakota birding email list. 

Incredible numbers of Painted Lady butterflies were seen yesterday along the southern tier of Nebraska counties. There were tens of thousands, the writer claiming no exaggeration. The writer mentioned a gravel road completely covered for about 12 feet. The butterflies were taking moisture from manure on the road. The butterflies are migrating to wintering ground in southern Mexico. There have been many reports on email lists recently of sightings of large numbers of these butterflies. This is an extraordinary year for this Painted Ladies.