Radroach (Fallout: New Vegas)

Radroaches are mutated insects found in the Mojave Wasteland in 2281.

Background
Great American cockroaches, colloquially called radroaches or simply giant cockroaches, are giant versions of the pre-war species that have increased in size presumably due to atomic fallout caused by the Great War, but this is unconfirmable due to the fact that cockroackes are the only creatures that are completely immune to radiation. Their increase in size could be due to the increase of other species size, or even because there is simply more space; much like how goldfish grow to different sizes depending on the size of their bowls in captivity. The mutations they have undergone include massively increased size, and now they are about as large as house cats.

Biology
Not nearly as common as in the Capital Wasteland, radroaches mostly inhabit abandoned homes and buildings (such as the Basincreek Building) to scavenge on food that was left behind by whoever previously lived there. Some can also be found in the toxic dumps and on or around the roads in between Goodsprings and Primm, as well as being able to survive in the hostile and toxic environment of the Sierra Madre and the Cloud.

Gameplay attributes
Radroaches are not normally aggressive if the player character keeps his distance. They are however, very territorial and will attack if the player seems to threaten them, either by having a weapon drawn, invading their habitat, battling another enemy nearby (which is limited to less than a foot around the creature), or attacking them directly. Generally, they will spread their wings and make distinct clicking sounds in warning before attacking.

Radroach
This is a normal radroach, with all the qualities mentioned above. This creature doesn't make much of a challenge for any level of PC. A single punch without any weapon can kill them easily.

Irradiated radroach
The irradiated radroach appears the same as a "normal" radroach but with the radioactive aura of a feral ghoul reaver and the ability to heal itself with a radiation blast similar to a Glowing One. It does not appear in Fallout: New Vegas without the use of console commands.

Appearances
The radroach appears in Fallout: New Vegas and its add-on, Dead Money.