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Revising the model, close to linear curve results in Reaches equilbirum. Growing oscillations and then towards elimination, see initial model. figure 18-5, Complex reality accounting for prey social behavior, Simplified expression of reality represented by sigmoidal curve ("S-shape like"), Complex reality accounting for hiding places, sigmoidal curve ("S-shape like") has diffrences, close to linear curve because Type I: Individuals consume more prey as prey density increases. Type II: Predators can become satiated and stop feeding., similarities is Same assumption for high values of deer density: the predators would be satiated at 60 kills per year., sigmoidal curve ("S-shape like") has similarities, sigmoidal curve ("S-shape like") results in Damped cycle with a period of 10 years. Cycles fade and find their way to the equilibrium - 4000 deer and 50 predators. Figure 18.7, Why are the sigmoidal functions appearing in the behavior of the predator-prey model? because Type III: Feeding rate is similar to logistic curve; low at low prey densities, but increases quickly at high densities