Pathfinder RPG Bestiary 2 - Rules of Play says:
The Pathfinder RPG Bestiary 2 is the second indispensable volume of monsters for use with the Pathfinder Roleplaying Game and serves as a companion to the Pathfinder RPG Core Rulebook and Pathfinder RPG Bestiary
Inside you will find:
- More than 300 different monsters
- Creatures both new and familiar, drawing upon the best-known beasts of legend, literature, and Pathfinder RPG adventures
- Challenges for any adventure and every level of play
- Hosts of new templates and variants, including simple templates for on-the-fly creature customization
- Numerous lists of monsters to aid in navigation, including lists by Challenge Rating, monster type, and habitat
- New rules for creating and running high-level menaces
- Expanded universal monster rules to simplify special attacks, defenses, and qualities
- New familiars, animal companions, and other allies