Lotka-Volterra Agent Model — Unlike the classic differential equation version, this spatial simulation runs individual agents on a grid. Sheep wander, eat grass, and reproduce when well-fed. Wolves hunt nearby sheep, gain energy from each kill, and reproduce too. Both lose energy each tick and die when depleted. Classic population cycles emerge: sheep multiply → wolves multiply → sheep depleted → wolves starve → sheep recover. Watch for spatial patterns: wolves create local "grazing refugia" where sheep survive to replenish the population.