Animals
There is a total of 36 animals in this expansion pack, including updated animals from the Dino Danger Pack and the two true unlockable animals (Extinct Animals is the first in the Zoo Tycoon franchise to have any). The Dino Danger Pack animals and objects are included, and all are updated, although they are still categorised in the animal adoption menu under "Dino Danger".
Read more about this topic: Zoo Tycoon 2: Extinct Animals