Jennings Environmental Education Center, Route 528, Brady Township, will host a spring warbler program in two different sessions on May 1, 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 including one on Saturday to the Macoskey Center at Slippery Rock University by calling 724-794-2434; and April 30 to Black/Celery/Pennsy Swamps State Game Lands 194 & 284 by calling 724-794-2434. 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 are open from dawn to dusk. Call 412-963-6100 or visit www.aswp.org.