It includes 30+ animals, new mini-games including fossil finding and dinosaur traquilizing, and many new prehistoric theme objects. It is the largest and the last expansion pack. Zoo Tycoon 2: Extinct Animals was release in October 2007.
As the player climbs through Challenge mode and Campaign mode, they will unlock a variety of building themes, special objects, or animals to use. Campaign mode contains a variety of scenarios for the player to encounter, whether it is breeding a certain animal, rescuing abused animals, creating a successful zoo, etc. As your zoo progresses, you earn and loss money, unlock new items or research new items, unlock new animals, and encounter gameplay or photographic challenges. Challenge mode starts off with the player on a limited budget, a limited number of animals and buildings. There are also two other modes to play Challenge and Campaign mode. The budget is unlimited so you don't have to worry about going backrupt. Freeform Mode allows you build create an type of zoo you want, the only main restriction being space, animals, and objects. There are many different gameplay modes to play each having their own limitations.