AS FALL APPROACHES, black bears enter a stage that biologists call hyperphagia, or excessive eating. Right now, it's not uncommon to find multiple bruins feeding at one food source, each gaining up to 2.2 pounds a day. So the first step is to find the grub. In the big woods, cherries, blueberries, apples, wild grapes, beechnuts, and acorns are tops. On the farm, ripe corn is the No 1 bear magnet.