Two species of fireflies active around sunset in an Illinois forest, one just above the forest floor (Pyractomena, the spots) and the other (Photinus) tracing lines a few feet above them. This photograph is a composite of many long exposures taken over a 23-minute interval. Homer Lake, Illinois, USA

During the day, night-flying fireflies like this Photinus pyralis sleep under leaves or in other inconspicuous hideouts. Urbana, Illinois, USA

During the day, night-flying fireflies like this Photinus pyralis sleep under leaves or in other inconspicuous hideouts. Urbana, Illinois, USA