Naturalist Jack Olzewski will lead weekly bird walks along the hiking trails at Renfrew Park. Walks begin at Renfrew’s lower parking lot off Welty Road. Participants should wear comfortable walking shoes and may bring identification books and binoculars. Free and open to the public. Note—Off-site Birding Field Trips: A couple of off-site birding trips may be arranged with walkers during Saturday morning sessions. For more information, visit www.renfrewinstitute.org, call 717-762-0373 or email to email@example.com.