What makes a person a social being?

What makes a person a social being? is whom he or she can call someone a friend. We all believe that no man is an island but often times we make ourselves an island around. Last time I spotted the 2 animals, these are very close to human being and sometimes they quarrel often times. However, as I observe them both of them enjoy their company. I even captured beautiful pictures to both of them. I realize that friendship is not only about you are in common to certain things but unity in diversity. I mean we can be common with our differences ....instead of our indifference.