Two Monarch butterflies feed on a Blazing Star plant at the USDA Forest Service's Midewin National Tallgrass Prairie on the site of the former Joliet Arsenal in Wilmington, Illinois, Friday, September 1, 2006.
Two Monarch butterflies feed on a Blazing Star plant at the USDA Forest Service's Midewin National Tallgrass Prairie on the site of the former Joliet Arsenal in Wilmington, Illinois, Friday, September 1, 2006. Chicago Tribune/MCT
Two Monarch butterflies feed on a Blazing Star plant at the USDA Forest Service's Midewin National Tallgrass Prairie on the site of the former Joliet Arsenal in Wilmington, Illinois, Friday, September 1, 2006. Chicago Tribune/MCT

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