Theoretical strategies for territorial prevention. The curve represents the evolution of sunflower surface at the consumable stage. The red surface represents the proportion of this surface consumed by a given number of birds. The first (top) strategy is to coordinate seedlings to provide a sunflower surface that goes far beyond bird consumption. The second (bottom) strategy is to reduce the pressure of predation by offering alternative resources, cultivated or not, or by reducing the population. The stability of bird consumption is hypothetical.