Experiments with fences that exclude deer and other plant herbivores from grazing showed greater plant biomass in fenced areas than in unfenced control areas. The few plant species that remain in unfenced areas are those that

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The few plant species that remain in unfenced areas are those that herbivores prefer not to eat, as these plants are less likely to be consumed and thus can survive in areas where herbivores are present.

Experiments with Fences That Exclude Deer and Other Plant Herbivores