in zoo tycoon 2 you can create your own zoo!or do watever you want with the animals (the carnivores hunt the herbivors to eat them)
you need to feed the animals and the visitors need lots of stuff (bastards) they are very demanding so the animals, you need to put the right fencr on the animal exibits or they escape for example the rhinos need a strong fence of concrete.and there are lots of expansions like extinct animals,marine mania,african animals,endangered species.i had a pack of zoo tycoon 2 with two expantions mixed but my sister broke the CD and now i can't play it was awesome.
here is some stuff: as you can see on this trailer it has lots of tools (water tool,elevation tool and diferent habitats to your animals needs) you can also download new animals and other stuff from oficial web site you can see that these animals are not in a zoo they are free to do this you close the zoo and you put animals and they reproduce and die of old age http://www.youtube.com/watch?v=20K7ptsM8WY&feature=related you can do storys like this

monkeys