All invited to help improve bird habitats by maintaining trails and clearing invasive shrubs at the WBNA Searles Nature Preserve. Dress for the weather; bring leather work gloves and water. Tools and know-how provided; bring your own tools, if you’d like. 1–3 p.m., Searles Nature Preserve; park along Bolla Rd., ¼ mile west of Stony Creek Rd., Ypsi. Free. washtenawbna.org.