Fallout 3 creatures

This is a list of all creatures known to appear in Fallout 3:

Animals

 * Brahmin
 * Centaur
 * Deathclaw
 * Molerat
 * Yao Guai
 * Dogs: Vicious Dog, Raider Guard Dog, Scavenger's Dog, Talon Company Guard Dog

Insects/Bugs

 * Ant Queen
 * Bloatfly
 * Fire Ant Worker
 * Fire Ant Soldier
 * Fire Ant Warrior
 * Fire Ant Nest Protector
 * Giant ant
 * Radroach
 * Radscorpion
 * Giant Radscorpion

Robots
Robots are not exactly creatures, but can be as much of a threat to your character (if not more). It appears robots have a weakness to laser weapons.
 * Eyebot
 * Mister Gutsy
 * Mister Handy
 * Protectron
 * Robobrain
 * Sentry Bot
 * Automated Turret