If you simulate the food chain more by making the rabbits compete for food (green dots) and the fox birth rate much lower than the rabbits / add starvation to t

If you simulate the food chain more by making the rabbits compete for food (green dots) and the fox birth rate much lower than the rabbits / add starvation to the equation (blue dots that don't eat rabbits with enough frequency disappear) you can capture the Apex predator effect too. Too few foxes and you'll see your rabbits eat all the green and the system similarly collapses.