Gorillas mostly live in family groups because of strong bonds between individuals. An average group contains about 12 animals with one or two older male silverback, younger blackback males, several females and their offspring. However gorillas follow no set pattern for group composition, smaller families are common. The lead silverback is the primary defender of the group and probably fathers most infants born.
Their social behaviour is notably calm and stable compared to other primates. Different groups of gorillas avoid meeting. Incase it happens, silverbacks being the dorminant adult male takes the challenge to intimidate its opponents by beating the chest,roaring,breaks branches, bare his teeth, waves his arms and stands upright to frighten off the others. When fighting occurs they use their long canine teeth to bite and slash, causing deep serious wounds.
In case the group leader is killed normally a younger male takes over and may kill all nursing infants in the group or sometimes they disperse trying to look for a new male that will give them better protection.
The younger gorillas learn from their mothers and other adults concerning the social behaviors, communication and how to look after the young.