Walruses eat penguins. When a walrus has caught sufficient penguins, it reproduces. Penguins reproduce from time to time. Walruses that catch no penguins for some time fade away and die. Based on the Lotka-Volterra Predator-Prey System. Shift-click the green flag to watch the ecosystem in turbo mode.
Exchanged the animals (too cold for rabbits in Antartica)
