Gnat
any of many species of tiny flying insects in the dipterid suborder Nematocera From Wikipedia, the free encyclopedia
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A gnat [1] is any tiny fly in the suborder Nematocera.[2]


"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”.[3]
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