Forest Preserves of Cook County
http://fpdcc.com/volunteer/
The Forest Preserves Cook County, with more than 69,000-acres, is the largest forest preserve district in the United States. It receives an estimated 40 million visits each year, providing an escape into a world teeming with wildlife and rich with outdoor recreation and environmental education opportunities. Within its boundaries are rare habitats that offer plant and animal diversity on par with the rainforests of the world. This natural heritage offers something for everyone. Volunteer with the Forest Preserves of Cook County!