Remember to back up your files before installing any hacks that modify game files in case you need to restore them.

Unlocks the campaigns and challenges contained in Endangered Species.

This hack unlocks ES Theme Objects, the Cat Climber, the Decorated Tour Gates, and the Breeding Centre without completing the scenarios/challenges.

Place options.xml in C:/Documents and Settings/YourUser/Application Data/Microsoft Games/Zoo Tycoon 2/Default Profile/.