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Fireflies or lightning bugs use specific flash patterns to signal potential mates. Their glow also lets predators know that they taste bad.

en.wikipedia.org/wiki/Firefly

The Lampyridae are a family of insects in the beetle order Coleoptera. They are winged beetles, commonly called fireflies or lightning bugs for their .... This and the facts that females do not light up at night and males are diurnal point to the ...

www.scientificamerican.com/article/how-and-why-do-fireflies

Fireflies produce a chemical reaction inside their bodies that allows them to light up. This type of light production is called bioluminescence. The method by ...

www.mnn.com/earth-matters/animals/stories/why-do-fireflies-glow

May 7, 2013 ... Fireflies have a chemical called luciferin. When luciferin combines with oxygen, the ensuing chemical reaction causes the abdomen to light up.

earthsky.org/earth/bugs-firefly-light

2 days ago ... A firefly's familiar glow is caused by chemical reaction. Explanation ... Did you ever do this? Image via ... Male fireflies also light up to signal their desire for mates – and willing females attract the males with flashes of their own.

news.nationalgeographic.com/2015/07/150724-fireflies-glow-bugs-summer-nation-science

Jul 24, 2015 ... Scientists have sussed out the chemical secret of these bright summertime beetles—and it may someday improve human health, a new study ...

learn.genetics.utah.edu/content/basics/firefly

Why do fireflies glow? One reason that fireflies glow is to attract a mate. Males and females of the same species will flash signals back and forth as a way of ...

www.firefly.org/facts-about-fireflies.html

Fireflies emit light mostly to attract mates, although they also communicate for ... In most, however, both sexes glow; often the male will fly, while females will wait  ...

animals.howstuffworks.com/insects/question554.htm

Fireflies or lightning bugs make light within their bodies. This process is called bioluminescence and is shared by many other organisms, mostly sea-living or ...

www.ask.com/youtube?q=Why+Do+Fireflies+Glow%3F&v=pTPMwZK2-yM
Jul 21, 2015 ... Warm summer nights wouldn't be complete without the beautiful glow of fireflies. But until recently, we didn't really understand how fireflies ...