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See this link: http://www.earthsky.org/shows/show.php?date=19800220 It is usually called a mating swarm. The males are searching for females to mate with. Many people confuse mosquito swarms with gnat swarms because they look similar at a distance.

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17y ago
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Wiki User

13y ago

i don't know. i just know they do it to be annoying.

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Q: Why do gnats fly in groups?
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