Fighting is found everywhere in the animal kingdom and nowhere so much as among human animals. Animals fight to get what they want--food, sex, territory, control, etc.--because there are other animals who want the same thing or who want to stop them from getting it. The same is true of human animals, except that we have developed more sophisticated techniques for getting our way. Being "rational animals," we have institutionalized our fighting in a number of ways, one of them being war. Even though we have over the ages institutionalized physical conflict and have employed many of our finest minds to develop more effective means of carrying it out, its basic structure remains essentially unchanged. In fights between brute animals, scientists have observed the practices of issuing challenges for the sake of intimidation, of establishing and defending territory, attacking, defending, counterattacking, retreating, and surrendering. Human fighting involves the same practices. Part of being a rational animal, however, involves getting what you want without subjecting yourself to the dangers of actual physical conflict. As a result, we humans have evolved the social institution of verbal argument. We have arguments all the time in order to try to get what we want, and sometimes these "degenerate" into physical violence.