I have been to the NC Zoo many times over the last 20 years. At least twice a year on average.
I like the zoo. Today, I learned how to let a chimpanzee know that I am friendly. And it really worked!
SPOILER ALERT!
You just drag your knuckles across the glass. Apparently, it lets the chimpanzee know he's in charge.
I do not know if that works in the wild. I guess you would need to carry a pane of glass with you at all times.
END SPOILER ALERT!
The NC Zoo has over five miles of paths that connect the exhibits. It is situated on 1,458 acres (according to Wikipedia, it is the largest walk-through natural-habitat zoo).
It is quite large.
And I'm totally convinced you could live in the woods at the zoo, undetected.
And you wouldn't even need any Rambo shit to pull it off.