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This is an overview article which contains background information and cross-game comparisons. For game-specific information and stats, see the articles linked on the right.
Gameplay articles
Fallout 3Bloatfly
Fallout: New VegasBloatfly
Legendary bloatfly Gametitle-FNV OWB
Fallout 4Bloatfly
Black bloatfly
Festering bloatfly
Glowing bloatfly
Fallout 76Bloatfly
Black bloatfly
Festering bloatfly
Glowing bloatfly
Loathsome bloatfly Gametitle-FO76 NW
Venomous bloatfly Gametitle-FO76 NW
Vile bloatfly Gametitle-FO76 NW
Deadly bloatfly Gametitle-FO76 NW
Scorched bloatfly

A bloatfly is a common mutated pest resembling an oversized blow-fly, often found in the Capital Wasteland, the Mojave Wasteland, the Commonwealth and Appalachia.


An impressive example of the mutations caused by the Great War, the bloatfly is an evolution of the Tabanus genera of biting horse fly. Tentatively classified as part of the Tabanidae family in the order Diptera, class Insecta, phylum Arthropoda, and kingdom Animalia, it is a major divergence from its evolutionary forebears.[1][2]


The standard bloatfly is covered in a green and brown carapace, it is significantly larger and more tenacious than its predecessor the horse fly. Although its size inhibits its flight characteristics and agility, making it impossible to feed like pre-War horse flies did. Instead, it uses its engorged stinger and pupae gestating within its abdomen to incapacitate prey. The stinger is capable of launching mature larvae with a barbed sting at the end. These latch onto the target and deliver a neurotoxin capable of incapacitating larger prey, allowing the bloatfly and its larvae to feed. Its neurotoxin is ineffective against humans and larger targets, with localized necrosis being the only larger complication. As a result, the bloatfly is frequently prey, rather than predator, particularly among wastelanders who learned how to prepare its meat (or can stomach eating it raw).[1] Some are noted to explode upon death.[3] Bloatflies can resort to scavenging in situations where prey or other sources of food are scarce.[4] It adapted to its enlarged size with a unique gland that enables it to balance and maintain speed despite its size. The gland itself may be toxic to consume.[5][2]


Bloatflies are a common sight in the wastes, exhibiting strong territorial instincts and an absence of any sense of self-preservations. They usually travel in packs of two to four and attack other living targets relentlessly, using their larvae to try and paralyze them from afar. They are easily dispatched with any kind of weapon, however.




The bloatfly is a giant mutated blowfly. Bloatflies attack at long range by peppering their prey with spine-bedecked larva launched from its abdomen. They tend to attack in groups, and their ability to attack from a distance can make them significantly more dangerous than radroaches.


  • Bloatflies can also be seen as a smaller species found around dead carcasses. It is not known why these did not mutate to a larger size.
  • When killed by the player character at higher levels they will give no experience points, much like the radroach.
  • Research by the Enclave suggests that the bloatfly is a mutation of the tabanus horse fly.



  1. 1.0 1.1 Enclave field research terminal entries; Enclave field research terminal, Field Entry: "Bloatfly"
  2. 2.0 2.1 The Sole Survivor: "Sign me up."
    Duff: "You're going to go out, and find a Bloatfly Gland. You see, the oversized Bloatfly of today evolved from an earlier species of smaller fly. Radioactive adaptation has resulted in a unique gland that enables it to balance and maintain speed despite its size. So what do you say? Ready to go out and dissect one?"
  3. Fallout 4 loading screen hints: "One of the Wasteland's most disgusting creatures, the Bloatfly shoots its maggots as projectiles, and often explodes upon death."
  4. Cassidy Caravans wreckage
  5. The Sole Survivor: "Get the Bloatfly Gland. Got it."
    Duff: "Remember, bring the gland back in one piece. Oh, and don't chew on it. One of the students got horribly sick because of that mistake."
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