Microsoft Game Studios announced today that Zoo Tycoon 2: Endangered Species, the highly anticipated expansion pack to the best-selling Zoo Tycoon 2, is now available at North American retailers. Microsoft also announced today that it has partnered with World Wildlife Fund (WWF) and will donate $25,000 to further WWF's conservation work.

Zoo Tycoon 2: Endangered Species explores many of the threats wild animals face, and the relationship with the WWF reflects Microsoft’s continued commitment to charitable giving and community involvement. The WWF will feature information about the Endangered Species expansion pack on their Web site, and information about the title will be sent to the WWF's membership. Other joint promotions will be announced in the coming months.

Zoo Tycoon 2: Endangered Species adds a new chapter to the wildly popular Zoo Tycoon 2, featuring 20 rare and exotic new animals, a new sky tram and elevated paths with guided Jeep tours that take players closer than ever to their animal habitats. The latest expansion introduces new building options, variations of the theme song and a rewards system acknowledging specific player accomplishments as they nurture a zoo over time.

Guest behavior modifications like dancing allow guests to express themselves more creatively; and new deviant animal behaviors including animals attacking guests and each other are sure to keep fans on their toes.

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