A male big dipper firefly signals in an ascending line. Urbana, Illinois, USA
Mating fireflies. Urbana, Illinois, USA.
A small male Photinus pyralis firefly mates with a female. Small males aren't as luminous or easy to see as large males, but they are more agile. Field studies have shown that small males are more successful at mating than large males when many males are present. Urbana, Illinois, USA
