Fallout: New Vegas Creatures

Humanoid

 * Ghouls
 * Humans
 * Nightkin
 * Super mutants

Non-humanoid

 * Big horner
 * Dog
 * Reptile dogs

Reptiles

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

Arthropods/Arachnids

 * Cazador
 * Giant ant
 * Mantis
 * Radscorpions