Fly

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

Characteristics
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.

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