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White-tailed deer eat large amounts of food, commonly eating legumes and foraging on other plants, including shoots, leaves, cacti in deserts, prairie forbs and grasses. They also eat acorns, fruit, and corn. Their special stomachs allow them to eat some things humans cannot, such as mushrooms and poison ivy. Their diets vary by season according to availability of food sources. They also eat hay, grass, white clover, and other foods they can find in a farm yard. Though almost entirely herbivorous, white-tailed deer have been known to opportunistically feed on nesting songbirds, field mice, and birds trapped in mist nets, if the need arises. A grown deer can eat around 2,000 lb of vegetable matter annually. A foraging area around 20 deer per square mile can start to destroy the forest environment. In Tompkins county in the Finger Lakes of NYS deer are a common sight in yards.