Fly

Flies are insects of the order Diptera, known to live throughout North America, from New California to the Commonwealth.

Characteristics
Unlike most bloatflies, the common fly weathered the apocalypse and came out seemingly unmutated. Their ecological niche remains unaltered as well: people view flies as little more than pests or vectors for disease, but they serve a vital role in the consumption of detritus. Much to the irritation of ghouls, this means that flies feed on the nutrients of their rotting bodies.

Appearances
Flies appear in Fallout 2, Fallout: New Vegas, Fallout 4 and Fallout 76. They are also mentioned in Fallout 3.