IDK how I wound up with 3rd-Ed. anything, but here I am. Still, while I plan on getting 4th-Ed., this Bestiary is fantastic. The alyout and feel reminds me very much of RoleMaster. It contains just about every animal you can imagine, most of which are so analogous as not to warrant their own entries, making it much easier to find what you're looking for.

If you enjoy RoleMaster, this book should be easy to navigate.