Zoo World and Zoo World 2
The Zoo World apps put you in charge of your own virtual zoo. Build, decorate and arrange your zoo habitats and fill them with animals from all over the world. Once your zoo is established you'll need to return frequently to care for your animals and make sure everything's running smoothly. Both versions of the game operate on the same premise, but Zoo World 2 puts more focus on the animals.
Farmville
In Farmville, you own and operate your own farm filled with plants and animals. Animals are harvested regularly for products like milk, eggs and wool. Specialized buildings allow you to house several of the same animal in one spot and harvest them with a single click. With care, you can even breed your animals. If you're interested in the wild creatures on your farm as well as the domesticated ones, a wildlife habitat is available for critters like skunks, squirrels and ermine.
Pet Society
Pet Society is a complete virtual world where your strange and whimsical creatures live and play. The Pets in this game can be fully dressed in a wide selection of clothing, shoes and accessories. Your pet's home is a blank canvas ideal for decorating with furniture, artwork and flowers. To earn the coins needed for all these items, you have to visit friends, compete in races at the stadium and perform other activities around town. Visit often to keep your pet happy -- it needs to be regularly fed, bathed and played with.
Happy Aquarium
If you prefer the low maintenance option of fish to furrier creatures, Happy Aquarium is the Facebook app for you. This game lets you build and decorate your own aquarium and fill it with a variety of colorful fish. Though simplistic in nature, this app still requires regular activity to keep things running smoothly. Fish need plenty of food and a clean environment to thrive.