So, I referenced the behavior of the infamous ants of Brazil from which Leiningen must protect his plantation. It would be fun to study some real-life insects to determine if they could grow so multitudinous or fierce as to overrun "civilized" spaces. Cicadas could be a fun local example this year, and mercifully less gory!
Who/what are the agents? Ants, plant life, human beings
What is the environment? Lush forest plantation
What are the interactions between agents and/or between agents and the environment? When an ant interacts with anything edible, it consumes it and gains energy. Upon reaching a given rate of energy, ants reproduce. If a human intersects with an any, the ant is dead and disappears.
Studying- how long will it take for Leiningen to be overrun? Should he have been? Did he have good data to fight instead of run away? What would you have advised that he do if you'd had your computer model to show him?