A bloatfly is a mutated blowfly with a green-brown carapace. Unlike the Capital Wasteland variety, bloatflies in the Mojave are largely docile, rather territorial and far less common. They are usually found around graveyards or pools of radiated water in groups of three to five.
Weak by nature, their attacks have very little effect. Their main attack consists of spitting spiked larvae at the player from a distance. They are relatively easy to kill in close combat, even if the player lacks any substantial skill in Unarmed or Melee Weapons, as they have very little health. However, it can be a bit tricky to hit them with a ranged weapon without the assistance of V.A.T.S., as they tend to move rapidly in sporadic patterns.
Unlike most other inhabitants of the Mojave Wasteland, bloatflies will often leave you alone if you walk away.
The normal variant with all of the attributes noted above.
The legendary variant found in the Big MT in the mysterious cave. It is considerably larger than the normal bloatfly and has a pale green aura, making it easier to spot in the cave. It also flies much higher, making striking it with melee weapons difficult. Unlike normal bloatflies, it fires an extremely high damage plasma-like projectile from its tail and it will explode like a plasma grenade when killed, leaving a goo pile instead of a corpse. The strength of its plasma attack is such that it can kill even high level players with just a few shots. If killed with a laser weapon critical it will leave a pile of goo and ash (both searchable) containing the same items. Like Gabe, the legendary bloatfly's immense size is suggested to be caused by a massive intake of chems, notably Buffout and Psycho.
You can also find two to four of them in the beginning of the game, in the Goodsprings Cemetery. However, these bloatflies will not respawn.
The player is likely to encounter many of them on the way to Primm from Goodsprings, as there are many tar pits scattered along the left side of the road.
They may spawn within the Camp Forlorn Hope graveyard next to the camp proper, but will be gunned down quickly. However, they can cause problems if attempting to talk to people outside who are near them, like Private Stone, as if the player is threatened the people in the camp will run around panicking. This can be amusing, though they cannot be talked to, thus preventing progressing with some quests. This can be solved by killing the bloatflies.