The "bell cow" is the lead cow of a herd. If you want to find the herd, listen for the bell cow. There's no collar, no bell awaiting Doug Martin at the Tampa Bay Buccaneers rookie mini-camp that starts on Friday over at One Buc Cow Palace. What awaits him are three days that could begin a journey that could take him into the starting lineup in September. Martin has the skill set to be a total player, a three-down back, a pure runner and pass-catcher in the NFL.