Jennings Environmental Education Center, Route 528 near the intersection of Routes 8 and 173, Slippery Rock, will host a guided walk at 2 p.m. Oct. 18. The 90 minute hike will focus on the transformation of trees during the fall. Jennings is open from sunrise to sunset for hiking. Call 724-794-6011.

<B>McKeever Environmental Learning Center</B>, 55 McKeever Lane, Sandy Lake, will host a "Feeding the Birds" program at 10 a.m. Sunday. A walk is set for 7:30 a.m. Oct. 17. Admission is free. Call 724-376-1000.