CRYSTAL LAKE – The McHenry County Conservation District plans a series of fall investigation programs for children.

• White-tail Trail: 6:30 to 8 p.m. Sept. 6 at Lost Valley Visitor Center in Glacial Park, Route 31 and Harts Road, Ringwood. Participants will take an evening hike in search of the white-tail deer. Along the way, they will learn facts about these creatures while looking for their tracks, trails and other signs. The program is free for county residents and $5 for nonresidents. The program is for adults and families. The registration deadline is Saturday.

• Creek Peek: 2 to 4 p.m. Sept. 8 at Keystone Road Landing in Glacial Park, 6500 Keystone Road, Wonder Lake. Participants should wear shoes they can wade in and come explore the amazing underwater world of Nippersink Creek. Participants will look for little critters and learn why they are so important to the creek. The program is free for county residents and $5 for nonresidents. It is for adults and families ages 5 and up. The registration deadline is Monday.