. Bulletin. Natural history; Natural history. 504 Illinois Natural History Survey Bulletin Art. 5: of several hardwoods, particularly of elms, maples and oaks, and the buds of sweet gum, ash and other tree species, fig. 23. "Budding," well described in gray squir- rels by Nichols (1927), Deuber (1934) and Terres (1939), begins in February in probably other acorns may be as early as July 15 in Illinois, most mast species are not used extensively until about mid August. Fruits of oaks, sugar maple and honey locust are commonly eaten in August and later, and are followed by. Fig
. Bulletin. Natural history; Natural history. 504 Illinois Natural History Survey Bulletin Art. 5: of several hardwoods, particularly of elms, maples and oaks, and the buds of sweet gum, ash and other tree species, fig. 23. "Budding," well described in gray squir- rels by Nichols (1927), Deuber (1934) and Terres (1939), begins in February in probably other acorns may be as early as July 15 in Illinois, most mast species are not used extensively until about mid August. Fruits of oaks, sugar maple and honey locust are commonly eaten in August and later, and are followed by. Fig, 24.—Corn cribs or corn shocks or fields adjacent to squirrel range offer the best feeding stations, and may carry normal squirrel populations through severe food shortages. Pike County. southern Illinois and extends into April. During late April and May, the winged seeds of the American elm are an impor- tant item, in the diet of Illinois squirrels. From mid May until late July mulberries are utilized in all regions where they oc- cur. Various bramble fruits, as well as wild cherries, wild grapes, wild strawber- ries and wild plums, are eaten during the summer and early fall as they become available. Corn, in the milk stage, is eagerly sought by both species during July and August, but is much more important to fox squirrels than to gray squirrels be- cause of the wide occurrence of the former in open, agricultural range. Fungi and herbage are taken probably in maxi- mum quantities during the spring and summer; ground feeding, in which fungi and herbage are mainly found, is most prevalent in July and August. It is dur- ing this period of extensive ground feeding that squirrels are most difficult to see in the woods. In Illinois, July and August usher in the principal mast season, the period of greatest food abundance for tree squirrels throughout the northern hemisphere. Although initial use of black oak and nuts of the hickories and walnuts. Pecans, beechnuts, hazelnuts, f
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