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This is an example from chapter 9 of the Greenfoot book.
It's a simulation of populations of foxes (blue squares) and rabbits (yellow squares).
Rabbits breed, and occasionally die of old age. They can also be eaten by foxes.
Foxes hunt rabbits, breed and die of starvation (if they don't find rabbits to eat) or of old age.
Also, pay attention to the pop-up window (which should appear somewhere on your screen).
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