To see the Illinois Butterfly Monitoring Network data for Nachusa Grasslands, click on the following link.
http://www.bfly.org/cgi-bin/data_form/released/view_data.html 
When the page is displayed, type - nachusa - in the search box at the bottom of the page, then click the View button.

Click the following link, Butterflies and Conservation, to see a video taken at Nachusa Grasslands which was produced for the Notebaert Nature Museum.