This is not entirely false. According to multiple GPS-aided research projects, bucks of all ages do indeed increase movement throughout the early stages of the rut. Thus, by default, they will move more at all periods of the day than at any other time. But that research was also very clear: The peak periods of movement fall during the first and last few hours of daylight. So why are all those stories of midday giants being killed during the rut? Well, I don't have any science to back up my theory, but the logic is sound: we take vacation time during the rut. We know bucks are active. Thus we spend many more hours in the woods, including all-day sits. More hours on stand during midday means more big bucks killed during midday.