Pros: The zoo is like an outdoor prison -- moats, fences and other barriers block out the zombies. Natural vegetation also provides some cover. The larger beasts (lions, tigers, bears) will provide extra security, and the smaller ones can be dinner. Cons: Here, you're more exposed to the elements. And since few animal predators like eating zombie flesh, if they escape they'll also be hunting you.
Kim Hairston, The Baltimore Sun