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A prehistoric stone tool discovered during a recent archeological dig at Midewin National Tallgrass Prairie. (Courtesy of Bill Parkinson)

With new tools at their disposal, archeologists are revisiting a prehistoric site discovered 40 years ago at what’s now Midewin National Tallgrass Prairie. “What we have here is a real unique opportunity to talk about how humans used this landscape over the last 10,000 years,” one researcher said. 

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Monarch butterflies roosting in Midewin National Tallgrass Prairie. (Courtesy of Ron Kapala)

Large numbers of monarch butterflies are making a pit stop at Midewin National Tallgrass Prairie during their annual fall migration. That’s just one of the ways to enjoy and explore nature this weekend.

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Bison at Midewin National Tallgrass Prairie. (USDA Forest Service)

Three calves, with their distinctive reddish-brown coats, were spotted this week at Midewin. Bison calves are typically born in April or May.

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Midewin, the first national tallgrass prairie in the U.S., was established Feb. 10, 1996, celebrating its 25th anniversary. (Patty Wetli / WTTW News)

The 18,000-acre restoration site continues to evolve, as this home of the former Joliet Arsenal gradually returns to its native prairie state. 

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(Cindy Parks / Pixabay)

From eating mosquitoes to restoring rainforests to making tequila (sort of), bats are amazing. The creature gets its due during International Bat Week, running through Oct. 31.

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Bison at Midewin National Tallgrass Prairie. (USDA Forest Service)

July is National Bison Month — who knew? Here’s where you can catch buffalo roaming, close to home, in Illinois and Indiana.

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The National Bison Legacy Act aims to put the largest land mammal in America on the same level as the bald eagle, the country's national bird and a cultural symbol of independence.