Little Savages is just a piece of fun. It was put together by Matt Squirrell, and is free to play. The idea of the game is to score points - you do this by creating Savages who roam the small 300x300km island of Saville. If the Savage does something good, such as eat an animal or have a baby, you get points.
Anyone can play, it's just a bit of fun. Your savages will get on without you and exist in their little Savage world.
Saville rotates around the Sun once every thirty minutes, meaning that one day on Saville lasts half an hour for us on Earth (convinient, huh?). This means that a Savage can perform 48 seperate actions in one Earth day.