Jennings Environmental Education Center, Route 528, Brady Township, will host a spring warbler program in two different sessions on Sunday, one from 8 to 10 a.m. and one from 10:30 a.m. to noon. Registration is required by Friday. “Spring Wildflowers” will be presented at 2 p.m. May 8. Call 724-794-6011.

Bartramian Audubon Society is offering birding field trips in Northwestern Pennsylvania including Sunday to Wolf Creek Narrows for a bird/wildflower stroll; May 7 to Buttermilk Hill Sanctuary; and May 14 for the spring migration bird count. Call 724-794-2434 to register or for more information. The trips are free.

Succop Nature Park, 185 W. Airport Road, Penn Township, hosts free birding and nature hikes with a naturalist at 9 a.m. Thursdays. Trails open from dawn to dusk. Call 412-963-6100 or visit www.aswp.org.