The white-tailed deer (Odocoileus virginianus)
-also known as the Virginia deer or simply as the whitetail, is a medium-sized deer native to the United States (all but five of the states), Canada, Mexico, Central America, and South America as far south as Peru.
Males compete for the opportunity of breeding females. Sparring among males determines a dominance hierarchy Bucks will attempt to copulate with as many females as possible, losing physical condition since they rarely eat or rest during the rut. The general geographical trend is for the rut to be shorter in duration at increased latitude. There are many factors as to how intense the “rutting season” will be. Air temperature is one major factor of this intensity. If there are fewer males or more females, then the selection process will not need to be as competitive.