I know this is a bit more of a casual gamer-type game, but I love it. I own Zoo Tycoon for the DS, with a cheat code I use to get every animal from the start. I find it cool, as I can breed incestual unicorns ("Unicorn Four gave birth!"...One and Two are dead. That leaves Three. Oh boy), fence in idiotic customers, and have okapis. One odd incident that happened to me was a sudden change in my saltwater crocodile's needs. One day, they needed mostly a saltwater exhibit, yet it changes so that they need mostly savannah grass to be happy! Odd. Any explanations?