Gnat facts for kids
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A female black fungus gnat
A gnat is any tiny fly in the suborder Nematocera.
"Gnat" is a loose descriptive category rather than a technical term. They can be both biting and non-biting. The biting ones are often called midges. Often they fly in large numbers, called clouds, in damp places like the Scottish Highlands.
One interesting group are the eye-gnats. the Smithsonian Institution describes them as “non-biting flies, no bigger than a few grains of salt, ... attracted to fluids secreted by your eyes”.
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Gnat Facts for Kids. Kiddle Encyclopedia.