Pathfinder RPG Bestiary - Rules of Play says:
What is a hero without monsters to vanquish? This 328-page book presents hundreds of different creatures for use in the Pathfinder Roleplaying Game. Within this tome you'll find fire-breathing dragons and blood-drinking vampires, vile demons and shapechanging werewolves, sadistic goblins and lumbering giants, and so much more!
The Pathfinder RPG Bestiary includes:- More than 350 different monsters
- Dozens of monstrous variants to modify creatures and keep players on their toes
- Numerous lists of monsters to aid in navigation, including lists by Challenge Rating, monster type, and habitat
- Extensive rules for creating effective and balanced monsters
- Rules for advancing monsters by hit dice, template, or class level
- Universal monster rules to simplify special attacks, defenses, and qualities like breath weapons, damage reduction, and regeneration
- More than a dozen feats tailored especially for monsters
- Suggestions for monstrous cohorts
- Two dozen additional animal companions
- More than a dozen different wandering monster encounter tables