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 Vicious dogs wont attack Mole rats.) The exception to this is that humans are always willing to fight most creatures 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

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

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 Protector, Marigold Ant Queen
 * Bloatfly
 * Radroach
 * Radscorpion, Giant Radscorpion, Albino Radscorpion (Broken Steel)
 * Mirelurk
 * Mirelurk Hunter, NukaLurk, Swamplurk (Point Lookout)

Extraterrestrials

 * Aliens (Mothership Zeta), Abomination (Mothership Zeta)