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Easter Eggs in both games
Zoey and Zeek
Main article: Zoey and Zeek
Zoey and Zeek are a pair of white mice and are the franchise's official mascots. Since the first game's cover, they have appeared in all of the games box art well hidden for the player to spot them. Ironically, they never appear in the game, but did have their own section in the official website called "Animal Escapades" in which they go to the zoo's exhibits and interview the animals living in them.
Easter Eggs in Zoo Tycoon
Blue Fang Plane
When the game date hits October 17, 2001, a red biplane with the Blue Fang flag trailing behind it will fly over your zoo. This is a reference to the release date of the first game.
When the game date hits October 31 each year, a witch flying on a broomstick followed by a group of bats will fly over your zoo while cackling. This is a reference to Halloween.
When the game date hits December 25 each year, Santa Claus will appear flying over your zoo in his magical sleigh with his flying reindeer, while laughing his trademark "ho ho ho!" This is a reference to Christmas.