I started this game just recently, and I found out I like it a lot.  It's a combination of both "Sims" and "Seaworld Adventure Park Tycoon" or "Sims Roller Coaster".  It is a game created by Lionhead, the same company that made the two Black and White's, which I like, too.  In fact, in the first Black and White that I played recently, I was able to defeat Nemesis.  It was actually pretty easy because I cheated, of course.  I have a zebra, but in case you're wondering, it's not the same one that is in Creature Isle.