Bartramian Audubon Society is offering birding field trips Saturday to Presque Isle State Park in Erie by calling 724-822-7507; April 23 to the Robert A. Macoskey Center at Slippery Rock University by calling 724-794-2434; and April 30 to Black/Celery/Pennsy Swamps State Game Lands 194 and 284 by calling 724-794-2434. The trips are free, but space is limited.

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.

Moraine State Park, Muddy Creek Township, hosts a “Growing Up WILD” teacher from 9 a.m. to noon Saturday at the Outdoor Center on the North Shore. The workshop is free but advance registration is required by e-mailing moraineenvedsp@pa.gov or calling 724-368-8811.