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Scientists recently created a model to predict how increasing human activity will affect future mammal population sizes in US national forests. Unfortunately, when the model is applied to large forests, its predictions for large-mammal populations are too high, and when applied to small forests, its predictions for small-mammal populations are too high. Beaverhead-Deerlodge National Forest in Montana is a large forest, covering more than 3 million acres. If used to evaluate the effect of increasing human activity on this forest in ten years, the model would likely therefore