Video of synchronous fireflies

Published at 11:18 p.m. on June 5, 2013 | Modified at 7:52 p.m. on June 6, 2013

A synchronous firefly display can now be seen at the Congaree National Park. No one is sure why this rare and unusual event happens during mating season. Competition between males may be one reason. Or perhaps if the males all flash together they have a better chance of being noticed, and the females can make better comparisons.

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