The Audubon Society hosts naturalist led walks at 9 a.m. Thursdays at the Succop Conservancy, 185 Airport Road, Penn Township. Call 412-963-6100 or visit www.aswp.org to register.

Jennings Environmental Education Center, Route 528, Brady Township, will conduct a spring wildflower walk at 2 p.m. Sunday. Registration for DiscoverE summer programs is being accepted. Call 724-794-6011.

Moraine State Park will show historic oil well operation from 10 a.m. to 4 p.m. Saturday at the central powerhouse beyond the Forestry & Regional office building on Park Road (Old Route 422) off Route 528.

McConnells Mill State Park in Slippery Rock Township, Lawrence County, will open the historic gristmill on May 18. Admission and parking are free. Call 724-368-8811.