From the Hero Games website:
LIONS, AND TIGERS, AND BEARS...
AND DRAGONS... AND UNICORNS... AND HARPIES...
No matter what genre, time period, or setting your campaign takes place in, the HERO System Bestiary has creatures and monsters for you to use! Designed for use with any HERO System game, the Bestiary describes dozens of real-world animals, fantastic beasts, monsters, and strange creatures from movies and science fiction. Each one comes with notes about how to adapt it for different types of games and player characters.
The Bestiary includes:
—Extensive rules for creating and using animals in HERO System games
—Over 80 fantastic beasts and monsters
—Over 80 real-life animals
—Over 20 movie and science fiction monsters
—Options for many creatures, plus a system of generic “templates” you can apply to any creature, giving you the ability to create hundreds more creatures with just a few seconds’ work