Why do fireflies synchronise their flashing?

Fireflies synchronise their flashing to attract mates more effectively. In some species, males flash in unison to create a coordinated display that is more noticeable to females. This behaviour is most common in large gatherings and may also help reduce predation by confusing predators. Synchronisation occurs through a combination of visual and internal rhythms, where fireflies adjust their timing based on the flashes of nearby individuals.