Last eight we killed were males, we killed most of the ones the dogs ran, that did not hole up. Maybe the ones that holed up were females. I did jump one rabbit while walking that I put the dogs on that they were unable to run, have had this happen before, and thought that some females may at certain times, not put off enough scent, for the dogs to be able to run. Kind of like when you shoot and miss and the dogs get to where you shoot and seem to lose the scent. I use to believe this was from the gun shot, but I tried shooting with a 17 rifle and even at 75 yards sometimes a missed rabbit, seems to lose scent. Also bow hunters report the same scent loss after a miss. I find that its the late season, especially February when we kill mostly males. Hope its not just because the owls kill more females. Too bad we can not tell them apart before shooting, as I would shoot very few females.