There have been smaller roosts a couple of times in the past, but this was at least 1000 butterflies at once. They have stayed for a week so far.
[Data Verifier Note: contacted observer for more information about this sighting]
Grand Ledge, MI
Latitude: 42.7 Longitude: -84.8
Observed by: Jan
The observer's e-mail address will not be disclosed.
Contact will be made through a web-based form.