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For the mutated fly, see bloatfly.


Flies are insects of the order Musca domestica, known to live throughout North America, from New California to the Commonwealth.[3]


Unlike most bloatflies, the common house fly weathered the apocalypse without significant mutations. Their ecological niche remains unaltered as well, serving 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.[1][4][2]


  • Flies can be seen hovering over dead bodies in Fallout 4.
  • Flies are seen surrounding meat piles and dead or decomposing bodies in Fallout 76.
  • A chalkboard in Appalachia displays research on flies, indicating their species and appearance of a seventh generation insect.[3]
  • Flies are mentioned in the Pioneer Scouts entomologist exam.[5]


Flies appear in Fallout 2, Fallout: New Vegas, Fallout 4 and Fallout 76. They are also mentioned in Fallout 3.[6]



  1. 1.0 1.1 The Chosen One: "{115}{}{Why are the flies coming here?}"
    Eric: "{124}{}{They come here because for some odd reason I exude fly nutrients. My body is rich with food for them, and this sweating just makes it worse.}"
    The Chosen One: "{125}{}{That's just plain nasty. Why not take a bath or something?}"
    Eric: "{128}{}{I've tried that. I've tried everything. The only thing that keeps the flies off me is not to sweat... and when I don't have enough power to keep cool, I can't.}"
  2. 2.0 2.1 Rose of Sharon Cassidy: "Even the flies here are chemed."
    (Rose of Sharon Cassidy's dialogue) Note: This line is spoken at Red Rock Canyon.
  3. 3.0 3.1 Insect DNA chalkboard information
  5. Pioneer Scout camp terminal entries; Entomologist exam
  6. Ranger compound terminal entries; Reilly's terminal, Personal Entry 177
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