I worked on this off and on over years. It is a finished, polished XNA implementation of the famous WA-TOR computer simulation described by A.K. Dewdney in "Scientific American" magazine, December, 1984 . The simulation allows the user to set life parameters that control the interaction between predator and prey populations. It demonstrates relationships that occur naturally with various species in the real world. This is nothing like the program described in the original article, especially with the visualization.
I am a game developer and did this as a side project to learn C#/XNA. I took the basic simulation concept and turned it into an interactive, graphically intensive, fun to play version. There are many versions of this simulation out in the wild, but this one is by far the most deluxe. Experiment with the settings or sit back and watch it run in automatic mode. Have a look at the page for more info. The Windows installer will also install detailed documents on scientific theory and program operation. Best to just let it run forever on big screen TV. Predict results. Relaxing.