It' s hard to judge ' em from bow hunting range without a good pair of " glasses" . And even harder from 50 yds. or more. My method is to avoid any small deer that is travelling alone, and to look at the nose of any deer before dropping the hammer on it. The yearlings will have a " stubby" nose compared to an adult doe, which usually has an elongated, or " muley" looking nose. No matter how hard you try, you' ll more than likely kill a " button" eventually if you enjoy a decent amount of success every year.