Bloatfly

A bloatfly is a common mutated pest resembling an over-sized blow-fly, often found in the Capital Wasteland and the Mojave Wasteland. A common encounter in the Wasteland, the comparatively diminutive Bloatfly is quite aggressive, often attacking animals much larger than itself with reckless abandon. Their ranged attacks are actually their eggs, so as to give the larva food when the prey lies dead.

Appearances
Bloatflies appear in Fallout 3 and Fallout: New Vegas.