Fallout 3 creatures

General information
All Fallout 3 creatures when in proximity of others will fight each other, so long as they are not in the same faction as grouped below. (For example, deathclaws will attack mirelurks, but feral ghouls will not attack glowing ones.) Deathclaws and Mirelurks are not affected by the Animal Friend perk as they are both considered abominations. Feral ghouls and swamp ghouls will be friendly if you have the Ghoul mask on. If you have the animal friend perk animals or creatures will come to your aid only agianst other enemys not other creatures. It is also possible to have other companions to help you fight creatures.

Humanoid

 * Ghoul
 * Feral ghoul
 * Reaver
 * Roamer
 * Glowing one
 * Swamp ghoul
 * Humans
 * Super mutants
 * Behemoth
 * Brute
 * Master
 * Overlord
 * Swampfolk
 * Scrappers
 * Brawlers
 * Creepers
 * Trackers
 * Bruisers
 * Trogs
 * Trog fledgling
 * Trog brute
 * Trog savage

Non-humanoid

 * Brahmin
 * Mad brahmin
 * Centaur
 * Mole rat
 * Pumpkin
 * Yao guai


 * Scavenger's yao guai


 * Dog
 * Guard dog
 * Raider guard dog
 * Scavenger's dog
 * Talon Company guard dog
 * Vicious dog

Reptiles

 * Deathclaw
 * Mirelurk
 * Mirelurk hunter
 * Mirelurk king
 * NukaLurk
 * Swamplurk
 * Swamplurk queen

Birds

 * Bird

Arthropods

 * Giant ant
 * Giant worker ant
 * Giant soldier ant
 * Giant ant queen
 * Mutated forager ant
 * Fire ant
 * Fire ant worker
 * Fire ant soldier
 * Fire ant warrior
 * Fire ant nest guardian
 * Marigold ant queen
 * Bloatfly
 * Radroach
 * Radscorpion
 * Giant radscorpion
 * Albino radscorpion

Extraterrestrials

 * Aliens
 * Abomination