This is a more complex population model representing a parcel of managed land. Moose can migrate in at agents represented by four outward-directed arrows. They can also exit at agents where there are four inward-directed arrows. New young moose sometimes appear when a male and female moose get close and they have some privacy. After a while, each young moose turns into either a male or female adult moose. You can add hunters that only shoot male moose.

There are two graphs. The left-hand one counts each adult moose every 100 cycles. This gives a short-term history of the population. When this fills after 1,000 cycles, the total count divided by 100 is transferred to one column in the right graph. This gives a long term history spanning 10,000 cycles.

Start over and reset the graphs by hitting the bell with the hammer.

Experiment with different locations of the entrance and exit agents. Change the shape of the background. Can you get a large population that is not affected by a reasonable number of hunters? You can find locations of the exit agent, where a slight change can cause a huge difference in the final population.

Look at the behavior of each agent. Do you understand the various rules? Learn by experimenting with different values and other changes.