Naturalist Jack Olszewski has spotted many species at Gettysburg battlefield. Bring binoculars, bird ID books, cameras, water, snacks, or lunch. Wear comfortable walking shoes. RSVP appreciated. For more information or directions, call Renfrew Institute at 717-762-0373. Free. For more information, call 717-762-0373 or email to info@renfrewinstitute.org.