Fallout: New Vegas Creatures

Humanoid

 * Ghouls
 * Humans
 * Super mutants
 * Nightkin

Non-humanoid

 * Big horner
 * Reptile dogs
 * Dog
 * Mole rat

Reptiles

 * Geckos
 * Little gecko
 * Golden gecko
 * Fire gecko
 * Deathclaws
 * Mirelurk king

Arthropods/Arachnids

 * Radscorpions
 * Cazador
 * Mantis