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, while Feral Ghouls will not attack Glowing Ones.) The exception to this is that humans are always willing to fight Ghouls and vice versa.

Humanoid

 * Ghoul
 * Feral Ghoul: Feral Ghoul Reaver (Broken Steel), Feral Ghoul Roamer, Glowing One, Swamp Ghoul (Point Lookout)
 * Humans
 * Super Mutants: Super Mutant Behemoth, Super Mutant Brute, Super Mutant Master, Super Mutant Overlord (Broken Steel)
 * Swampfolk (Point Lookout): Brawlers, Bruisers, Creepers, Scrappers, Trackers
 * Trogs (The Pitt): Trog Brute, Trog Fledgling, Trog Savage
 * Aliens (Mothership Zeta), Abomination (Mothership zeta)

Non-Humanoid

 * Brahmin, Mad Brahmin
 * Centaur
 * Mole Rat
 * Yao Guai
 * Dog
 * Guard Dog, Vicious Dog

Reptiles

 * Deathclaw, Mirelurk King, Swamplurk Queen (Point Lookout)

Birds

 * Bird

Crustaceans

 * Mirelurk
 * Mirelurk Hunter, NukaLurk, Swamplurk (Point Lookout)

Insects and arachnids

 * 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 Protector, Marigold Ant Queen
 * Bloatfly
 * Radroach
 * Radscorpion, Giant Radscorpion, Albino Radscorpion (Broken Steel)