Aggressive behavior has many faces and forms. Aggressive styles are also subject to
developmental change during the life course. Among animals and young children lacking verbal
skills, aggression is predominantly physical. Verbal skills, when they develop, are utilized not
only for peaceful communication, but also for aggressive purposes. When social skills develop, even
more sophisticated strategies of aggression are facilitated with the aggressor able to harm a
target person without even being identified: These may be referred to as indirect aggression , and a
developmental theory was presented according to which aggressive behavior tends to appear in the
above mentioned order: