To leave the zoo enter:
UNLOCKEXIT
The trick is
Each exhibit describes an animal that has one letter of its name changed to another letter suggested by the clued description for what the new animal name might describe, as we see in the examples.
Here are the exhibits I have so far:
1. Chimpanzee -> CHIMPUNZEE
2. Wildebeest -> WINDEBEEST
3. Elephant -> ELEPLANT
4. Capybara -> COPYBARA
5. Starfish -> SCARFISH
6. (O->K)
7. Rhino -> REINO
8. Boa -> BOX
9. Butterfly -> BITTERFLY
10. (S->T)
Then,
make the same replacement in the provided password's letters, changing the first letter the same way the first exhibit's animal had a letter replaced and so on. Doing this lets us find the actual password from the supplied letters. It also lets us determine what the letter replacements will be for the as-yet unsolved exhibits.
Updates to follow.