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Herbivores forage in a complex environment. How do they learn which foods are nutritious and which foods are toxic or low in quality? Herbivores begin learning about what foods are safe before they are even born and continue the process throughout their life enabling them to survive in a world where toxin and nutrient levels of forages are constantly changing. These same processes allow them to make foraging decisions when they are moved to new pastures with unfamiliar foods.