Since the apparition of Classic Horrors Revisited, Paizo Publishing made clear Pathfinder wasn't just about the usual tropes concerning Sword and sorcery in pen and paper RPGs as elements from other genres belonging to fantasy like Planetary Romance and Gothic Horror appeared in the main setting. This book is the first to dare enter into a terrain which doesn't belong to literature but to oral tradition and speculation, in this case what in contemporary culture is known as urban legends as well as cryptozoology.
The readers can enjoy quite detailed entries concerning the habits and behavior of beasts which belong to pop culture collective imaginary and how introduce them into a world of high adventure and magic: the chupacabra, the yeti, the sasquatch...
A well done job, but somehow lacks of the same detail displayed in other Revisited series handbooks, perhaps because this was the first attempt into creatures which didn't had a true or solid mythological or literary background (or in some cases, decades of game tradition), depending on very speculative and not very academic sources for it's development.