As the first expansion to Zoo Tycoon 2, Zoo Tycoon 2: Endangered Species adds 20 rare animals to the game, as well as new features such as vehicle tours, sky trams, and elevated walkways and observation decks. Also included are a series of new challenges relating to the preservation of endangered animals, and many new zoo objects and game enhancements.

As the first expansion to Zoo Tycoon 2, Zoo Tycoon 2: Endangered Species adds 20 rare animals to the game, as well as new features such as vehicle tours, sky trams, and elevated walkways and observation decks. Also included are a series of new challenges relating to the preservation of endangered animals, and many new zoo objects and game enhancements.