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' familiar and more novel animals:
1. Chimpanzee -> CHIMPUNZEE
2. Wildebeest -> WINDEBEEST
3. Elephant -> ELEPLANT
4. Capybara -> COPYBARA
5. Starfish -> SCARFISH
6. Crocodile -> CROCKDILE
7. Rhino -> REINO
8. Boa Constrictor -> BOX CONSTRICTOR
9. Butterfly -> BITTERFLY
10. Sea Lion -> TEA LION
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!