Carl that's why I asked that question. We saw about 80:20, drakes to hens. I "learnt", from Harold Prince's course, that nest parasitism was a strategy to diminish on-nest predation mortality. Two years ago we timed our trip east well, too, and saw a much elevated hen component with about the same total numbers on this river segment. They tend to concentrate in southern Lake Nicolet, Lake George, and the Potogannising Bay area, as well as Hessel.