The Brothers Grimm collected many fine fairy tales illustrating the dangers of antagonizing woodland creatures by, for instance, stealing their porridge. They neglected to mention, however, the dangers of enticing them with birdseed, garbage or undersized pets. The American black bear is native to the area and its local population has been showing up in Greenfield’s “urban” neighborhoods this week. Montague and Sunderland police also logged reports Saturday and Sunday of bears in backyards, singly or in family groups. A Montague Road, Sunderland, resident on Saturday reported a black bear active in the area for almost a month and in a neighbor’s yard almost every … 0