A little more than a month since the Super Bowl XLVII victory parade, the party has officially ended for the Ravens. When they next take the field for the start of organized team activities, the Ravens will have a significantly different look from the group that beat the San Francisco 49ers, 34-31, on Feb. 3 to capture the second world championship in franchise history. Since their offseason began, they have lost eight players who were starters at different points of this past season. The exodus, which began with the retirement of center Matt Birk and middle linebacker Ray Lewis and the release of guard Bobbie Williams, accelerated over the last seven days and after free agency began.