What gender is the animal you're tracking? Whether we're talking about deer, elk or moose, in every case the males have bigger bodies than the females. The most reliable and credible clue, therefore, is the size of the track. Some argue that you can sex an animal based on the shape or position of the tracks, the presence of dew claw marks and other factors, but I'm not always so sure. If you're following a mature buck, the size of his tracks should be a dead giveaway, especially if it's during the rut and the deer is traveling alone. But smaller 2- or 3-year-old bucks, which might not be much bigger than an old doe, could be much tougher to properly sex.