If the birds of northeast Iowa could talk, they might complain about the fastest weight loss pill that a young male black bear that has ambled along the river valleys here and raided many of their favorite backyard feeders.But the human residents I talked to last week have been fascinated by their mysterious, fuzzy visitor.It has been the month of the bear in Iowa, since one of his first confirmed appearances on Wednesday, May 26, on the porch of a riverside cabin north of Otranto, near the Minnesota border.