Fireflies or lightning bugs, no matter what you call them, their flashing light seen throughout the night heralds the official arrival of summer. Join a naturalist on this popular hike and discover why fireflies flash back and forth to each other and what it means. Let the magic of “lightning bugs” entrance you on this summer night adventure. Participants should be prepared to walk more than 1 mile outdoors on natural surface trails across uneven terrain.

Saturday, July 22. 7:30–9:30 p.m. Free! All ages. Registration required by Thursday, July 20. Call 708-747-6320.