Zoo Tycoon DS [NDS]

All animals, folige, building, etc
at the main menu screen press (up, up, down, down, left, right, left, right).you should hear a elaphant if done right

Bonus scenarios
There are four bonus scenarios that are unlocked by completing a scenario on different difficulty settings.

Guest Codes
Rename a guest to the name given for the desired effect.

Andrew Binder - All Animal Houses
Lou Catanzaro - All animal toys
Charlie Peterson - All Foliage
Dr Dolittle - Animals breed more
Mr. Blue - Changes everyone's shirt blue
Mr. Brown - Changes everyone's shirt Brown
Mr. Orange - Changes everyone's shirt Orange
Mr. Pink - Changes everyone's shirt Pink
Mr. White - Changes everyone's shirt white
Mr. Blonde - Changes everyone's shirt yellow
Akiyama - Completes All Scenarios
Bill Gates - Donates a lot of money
Adam Levesque - Get all Animal Shelters
Zeta Psi Make - Some Guests sick
Steve Serafino - Unlock Endangered animals
John Wheeler - Unlocks All Animal Shelters Available

Control credits screen:
At the credits screen, tap the lion at the bottom of the screen. It will put a piece of trash in the trash can. If you tap it again, it will take it out.