Wolf Sheep Predation
This model explores the stability of predator-prey ecosystems. Such systems are called unstable when they tend to result in extinction for one or more species involved. In contrast, systems are stable when they tend to maintain themselves over time, despite fluctuations in population sizes.
For detailed instructions on using the program, take a look at the info window from the Wolf Sheep Predation model.
Click on one of the pictures to see a quicktime movie of the model: