Crews for the Oswegoland Park District were busy April 9 conducting a controlled burn in the natural area adjoining the Waubonsie Creek Trail in Oswego's Mill Race Creek subdivision. The park district, like other area open land managers, conduct the burns every spring to remove exotic plants and grasses, restore wildlife habitats and return essential nutrients to the soil in natural areas. In addition, according to the park district's website, burning is the most cost effective method to control invasive plant species such as Canada Thistle and Multi-Flora Rose. Prairie plants have roots that can reach up to 12 feet deep while invasive species have roots that stay near the surface. Therefore, the burns will harm the roots only of those non-native species and the prairie plants can thrive, according to the website. These photos were captured by Chris Frunzar, an Oswego resident and freelance photographer.