Jennings Environmental Education Center, Route 528, Brady Township, will be the site of “Nature Detectives: Map Mysteries” at 2 p.m. Sunday (registration due by Friday). Visit http://events.dcnr.pa.gov or call 724-794-6011. The Christmas Bird Count is scheduled for 9 a.m. to noon Dec. 14. Jennings will provide an indoor observation station for anyone who is interested in attending the informal session.