This info originally came from a site which is no more, The Compost Heap.
Toggles:
Ctrl-c toggles your mouse icons
Ctrl-f toggles foliage drawing
Ctrl-g toggles grid lines
Ctrl-p takes a screenshot
Cheats -
(to turn off any of these cheats, exit Zoo Tycoon and re-enter)
Name a guest:
Adam Levesque - All animal care programs will be available
Akiyama - All scenarios become available
Andrew Binder - All animal houses will be available
Bill Clinton - Hamburger sales increase
Bill Gates - Donation amounts increase
Charlie Peterson - All exhibit foliage will be available
Hank Howie - All zoo staff research will be completed
John Wheeler - All animal shelters will be available
Lou Catanzaro - All animal toys will be available
Steve Serafino - All endangered animal research will be completed
"Mr. Blue" - All guest's shirts turn blue
"Mr. Blonde" - All guest's shirts turn yellow
"Mr. White" - All guest's shirts turn white
"Mr. Brown" - All guest's shirts turn brown
"Mr. Orange" - All guest's shirts turn orange
"Mr. Pink" - All guest's shirts turn pink
"Alfred H" - flocks of birds appear to chase and scare people
(Genki's note: I've tried this, as I've
been told that doing so will get guests to leave your zoo quickly, still
happy, and therefore gaining you many benefactors. Above it says that
turning off your game and restarting it will turn off the cheat, but
when I tried, the birds were still scaring the guests :()
"Russel C" - all fences in the zoo deteriorate 100%
"Zeta Psi" - All guest's shirts turn yellow and they vomit
These "guest cheats" only last while that guest stays in the zoo, the
people you might not know above (John Wheeler, Charlie Peterson, etc.)
were involved in the game development - see the credits.
Toggles:
Ctrl-c toggles your mouse icons
Ctrl-f toggles foliage drawing
Ctrl-g toggles grid lines
Ctrl-p takes a screenshot
Cheats -
(to turn off any of these cheats, exit Zoo Tycoon and re-enter)
Name a guest:
Adam Levesque - All animal care programs will be available
Akiyama - All scenarios become available
Andrew Binder - All animal houses will be available
Bill Clinton - Hamburger sales increase
Bill Gates - Donation amounts increase
Charlie Peterson - All exhibit foliage will be available
Hank Howie - All zoo staff research will be completed
John Wheeler - All animal shelters will be available
Lou Catanzaro - All animal toys will be available
Steve Serafino - All endangered animal research will be completed
"Mr. Blue" - All guest's shirts turn blue
"Mr. Blonde" - All guest's shirts turn yellow
"Mr. White" - All guest's shirts turn white
"Mr. Brown" - All guest's shirts turn brown
"Mr. Orange" - All guest's shirts turn orange
"Mr. Pink" - All guest's shirts turn pink
"Alfred H" - flocks of birds appear to chase and scare people
(Genki's note: I've tried this, as I've
been told that doing so will get guests to leave your zoo quickly, still
happy, and therefore gaining you many benefactors. Above it says that
turning off your game and restarting it will turn off the cheat, but
when I tried, the birds were still scaring the guests :()
"Russel C" - all fences in the zoo deteriorate 100%
"Zeta Psi" - All guest's shirts turn yellow and they vomit
These "guest cheats" only last while that guest stays in the zoo, the
people you might not know above (John Wheeler, Charlie Peterson, etc.)
were involved in the game development - see the credits.