Acer saccharinum
In Michigan, fox squirrels feed on a variety of foods throughout the year. Spring foods are mainly tree buds and flowers, insects, bird eggs, and seeds of red maple ("Acer rubrum"), silver maple ("Acer saccharinum"), and elms. Summer foods include a variety of berries, plum and cherry pits, fruits of basswood ("Tilia americana"), fruits of box elder ("Acer negundo"), black oak acorns, hickory nuts, seeds of sugar ("Acer saccharum") and black maple ("Acer nigrum"), grains, insects, and unripe corn. Fall foods consist mainly of acorns, hickory nuts, beechnuts, walnuts, butternuts ("Juglans cinerea"), and hazelnuts. Caches of acorns and hickory nuts are heavily used in winter.