An example of the mutations caused by the Great War, the bloatfly is an evolution of either the Musca domestica (common housefly) or 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 by the Enclave, it is a major divergence from its evolutionary forebears.
The standard bloatfly has a green and brown carapace and is significantly larger and more tenacious than its predecessors. Its size inhibits previous 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, causing only localized necrosis. As a result, the bloatfly serves as prey rather than predator among wastelanders who utilize its meat for food. Bloatflies can resort to scavenging in situations where prey or other sources of sustenance are scarce. 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.
Bloatflies are a common sight in the wastes, varying in size and exhibiting territorial instincts alongside an absence of self-preservation. They can be found in swarms of two to four and will attack targets relentlessly. Bloatflies may explode upon death.
Bloatflies attack at long range by peppering their prey with spine-bedecked larva launched from its abdomen. They tend to attack in groups, and may pose an additional threat based on their ability to attack from a distance.
Killing bloatflies at higher levels will garner no experience points.
↑ 3.03.1The 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?" (DoctorDuff.txt)
↑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?" (DoctorDuff.txt)
↑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." (DoctorDuff.txt)
↑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."