You follow the path, and indeed, you walk right by the North American Wildlife pens. By one of the animal enclosures, you see another sign, pointing you further down the path. It simply reads "Cryptozoology".
You walk deeper and deeper into the zoo, following the path for miles. You consider stopping and going back, but each time you think you've somehow missed the exhibit, another sign appears, almost magically, encouraging you to continue. Finally, you see a wall, approximately fifteen feet high and made of cement. There are three doors, each with handmade placards, set into the wall.
The leftmost reads "Shapeshifters".
The middle one reads "Undead"
The third reads "Other"