The Audubon Society hosts naturalist led walks at 9 a.m. Thursdays. Call 412-963-6100 or visit www.aswp.org to register.

Jennings Environmental Education Center, Route 528, Brady Township, will take registration for Take Back the Woods: Battling Invasive Species” from Friday through April 12. Individuals willing to spend a day helping the park manage invasive plants are needed. The event is 9 a.m. to 1 p.m. April 20. Participants must be 12 or older and must register. Lunch will be provided, and each participant will receive a native plant to take home. Call 724-794-6011 or visit www.dcnr.state.pa.us/Calendar.