From Microsoft Game Studios:
Zoo Tycoon puts you in charge of your very own zoo. You'll be challenged to design, build, and manage a vibrant place where your animals and guests are happy. You have more than 40 different animals to choose from, including chimpanzees, camels, and tigers. This demo version lets you play a couple of tutorial scenarios and gives you a free play map where you can build a zoo from scratch, using several different types of building materials and terrain types with up to four popular animals, including Thomson's gazelle, a giraffe, an African lion, and Bengal tigers.