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Vashtanest

A typical sample.

Vashta Nerada are microscopic black dots that consume flesh. They exist literally everywhere in vicious swarms, and usually camouflage themselves either as your shadow right now or (in a more recent evolutionary adaptation) as black pixels on a white page.

After making their debut in season one X-Files episode Darkness Falls, they went on to great fame as the villains of A River Song Ending.