The prey will swarm and the predators will feed or die. Both will evolve to survive.
Now the science: Predator Prey Live Wallpaper is a 2D simulation of a predator prey ecosystem. The movements of both predators and prey are controlled by a few simple rules which you have complete control of. Over time, both predators and prey will reproduce evolved offspring. Touching the screen will drop food which help your prey survive.
You can spend hours customizing the movements of both predators and prey to achieve different behaviors. The shapes of both predator and prey can be adjusted from animated fish, sharks and birds, to simple geometric shapes. Colors, backgrounds and many other features are fully customizable.