Stacked photo of fireflies in Tennessee. Image via University of Colorado.
Male fireflies light up in sync when they are grouped with other male fireflies, while lone fireflies flash without a distinct pattern, suggesting the syncing is social and not innate, according to findings published in the Journal of The Royal Society Interface. Researchers filmed fireflies while they were active during summer in the Smoky Mountains National Park in Tennessee to see the synchronization first-hand.
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