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Zoo Tycoon: Marine Mania is an expansion pack for Zoo Tycoon. It was released on October 17, 2002, exactly 1 year after the original game. This was the 2nd expansion pack for the Zoo Tycoon series and was often bundled with Dinosaur Digs, especially in the US and Canada. It was later also bundled into Zoo Tycoon: Complete Collection.
As the name suggests, Marine Mania focuses on marine animals. The player has the option to make tanks using brand-new fencing specifically designed to contain marine animals.
There are 2 new features included in Marine Mania. The first is the ability to create Marine Shows. By connecting the tank of certain animals to a specifically designed show tank, the player can create their own show, choosing which tricks the animals will perform and how often they will be held. The second is to build "combined" exhibits, which consist of tanks with a land section for amphibious animals to access. The majority of animals from the original game and Dinosaur Digs that could swim gain access to tanks (the only exception is the Greater Flamingo), but only a zookeeper can tend to them.
Zoo Tycoon: Marine Mania had a few bonus downloads released to accompany it. The bonus downloads would only be fully functional if the player had Marine Mania installed.
Most animals that previously swam in water tiles were updated with new animations for swimming in tanks. Additionally, these animals had updated icons to reflect this change. Furthermore, the California Sea Lion's icon includes a star to indicate that it can perform in marine shows.